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  • Rio All-Suite Casino (hotel and casino, Las Vegas, Nevada, United States)

    Las Vegas: Cultural life: The Rio All-Suite Casino has frequently hosted touring exhibits from around the world, including a collection of art from the Hermitage museum in St. Petersburg.

  • Río Artibonito (river, Hispaniola)

    Artibonite River, river, the longest on the island of Hispaniola. It rises in the Cordillera Central (Cibao Mountains) of the Dominican Republic and flows southwest along the border with Haiti and then west and northwest into Haiti and through the fertile Artibonite Plain to enter the Gulf of La

  • Río Bec (region, Mexico)

    pre-Columbian civilizations: Major sites: …north of Petén is the Río Bec zone, as yet little explored but noted for temple pyramids and palaces with flanking false towers fronted by unclimbable “stairways” reaching dummy “rooms” with blank entrances. Río Bec structures are carved with fantastic serpents in deep relief, a feature that becomes even more…

  • Rio Branco (Brazil)

    Rio Branco, city, capital of Acre estado (state), western Brazil. It lies on the west bank of the Acre River, just north of where the Branco River (Rio Branco) flows into the Acre. A commercial and distribution centre, Rio Branco exports rubber, metals, medicinal plants, Brazil nuts, timber, and

  • Rio Branco (state, Brazil)

    Roraima, estado (state), northern Brazil. It is bordered on the north by Venezuela, on the east by Guyana and the state of Pará, and on the south and west by the state of Amazonas. Formerly a part of Amazonas, it was created a territory by decree in 1943 and until 1962 was named Rio Branco. It

  • Rio Branco Law (Brazil [1871])

    Rio Branco Law, measure enacted by the Brazilian parliament in 1871 that freed children born of slave parents. The law was passed under the leadership of José Maria da Silva Paranhos, Viscount do Rio Branco, premier during 1871–73, and Joaquim Nabuco de Araujo, a leading abolitionist. Although the

  • Rio Branco, José Maria da Silva Paranhos, Baron of (Brazilian statesman)

    Francisco de Paula Rodrigues Alves: Through his foreign minister, José Maria da Silva Paranhos, border disputes were settled peacefully with Bolivia, Uruguay, British Guiana, and Suriname (Dutch Guiana). In 1918 Rodrigues Alves was reelected president of Brazil but died before he could take office.

  • Río Bravo (river, United States-Mexico)

    Rio Grande, fifth longest river of North America, and the 20th longest in the world, forming the border between the U.S. state of Texas and Mexico. Rising as a clear, snow-fed mountain stream more than 12,000 feet (3,700 metres) above sea level in the Rocky Mountains, the Rio Grande descends across

  • Rio Bravo (film by Hawks [1959])

    Rio Bravo, American western film, released in 1959, that was one of the most enduring collaborations between director Howard Hawks and star John Wayne. Sheriff John T. Chance (played by Wayne) presides over the small Texas town of Rio Bravo. When Joe Burdette (Claude Akins) is arrested for murder,

  • Río Catatumbo (river, South America)

    Catatumbo River, river rising in northern Colombia. It flows northeast across the Venezuelan border, crosses rich oil-bearing regions in the Maracaibo Lowland, and empties into Lake Maracaibo after a course of about 210 miles (338 km). It is navigable in its lower course and receives Zulia River 4

  • Río Chagres (river, Panama)

    Chagres River, stream in Panama forming part of the Panama Canal system. It rises in the Cordillera de San Blas, flows south-southwest, and broadens to form Madden Lake (22 square miles [57 square km]) at Madden Dam, which was built in 1935 for navigation, flood control, and hydroelectric power.

  • Río Chubut (river, Argentina)

    Chubut River, river in southern Argentina, rising in the Andes Mountains south of San Carlos de Bariloche in Río Negro provincia (province). It flows southward and then eastward, emerging from the Andes in northwestern Chubut province. It then flows generally southeastward to the Pass of Indios,

  • Rio Claro (Brazil)

    Rio Claro, city, in the highlands of east-central S?o Paulo estado (state), southeastern Brazil. It is situated at 2,050 feet (625 metres) above sea level along the Corumbataí River. Formerly called S?o Jo?o Batista da Beira do Ribeir?o Claro and S?o Jo?o Batista do Morro Azul, it was given town

  • Río Coco (river, Central America)

    Coco River, river in southern Honduras and northern Nicaragua, rising west of the town of San Marcos de Colón, in southern Honduras, near the Honduras-Nicaragua border. The Coco flows generally eastward into Nicaragua, then turns northward near Mount Kilambé. For much of its middle and lower c

  • Río Colorado (river, Argentina)

    Colorado River, river in south-central Argentina. Its major headstreams, the Grande and Barrancas rivers, flow southward from the eastern flanks of the Andes and meet north of Buta Ranquil to form the Colorado. The river flows generally east-southeastward across the arid terrain of northern

  • Río Cuarto (Argentina)

    Río Cuarto, city, southwestern Córdoba provincia (province), north-central Argentina. It lies along the Cuarto River between the western reaches of the Pampas and the foothills of the Cóndores Mountains. The city was inaugurated in 1794 under the sponsorship of Governor Rafael de Sobremonte, the

  • Rio Cuiabá (river, Brazil)

    Cuiabá River, river, central Mato Grosso state, Brazil, rising northeast of Rosário Oeste, between the basins of the Amazon and Paraguay rivers, and flowing for 300 miles (480 km) south-southwest to join the Sa? Louren?o River. These two rivers’ combined courses, sometimes called the Cuiabá,

  • Rio de Janeiro (Brazil)

    Rio de Janeiro, city and port, capital of the estado (state) of Rio de Janeiro, Brazil. It is located on the Atlantic Ocean, in the southeastern part of the tropical zone of South America, and is widely recognized as one of the world’s most beautiful and interesting urban centres. Although Rio de

  • Rio de Janeiro (state, Brazil)

    Rio de Janeiro, estado (state) of southeastern Brazil, bounded by the states of Espírito Santo (north), Minas Gerais (west), and S?o Paulo (southwest), while to the east lies the Atlantic Ocean. It is named for the city of Rio de Janeiro, the state capital, which was the capital of Brazil from 1763

  • Rio de Janeiro 2016 Olympic Games

    Rio de Janeiro 2016 Olympic Games, athletic festival held in Rio de Janeiro that took place August 5–21, 2016. The Rio Games were the 28th occurrence of the modern Olympic Games. The event marked the first time that either the Summer or the Winter Olympics was held in South America. Rio was awarded

  • Rio de Janeiro Bay (bay, Brazil)

    Guanabara Bay, bay of the Atlantic Ocean, southeastern Brazil, with Rio de Janeiro on its southwest shore and Niterói on its southeast. Discovered around 1502, it was originally named Rio de Janeiro Bay. About 19 miles (31 km) long with a maximum width of 18 miles, it has a mile-wide entrance that

  • Rio de Janeiro Botanical Garden (garden, Rio de Janeiro, Brazil)

    Rio de Janeiro Botanical Garden, one of the great tropical botanical gardens and arboretums of the world. It was founded in 1808 by John, prince regent of the United Kingdom of Brazil and Portugal (later King John VI), for introducing and acclimatizing economically beneficial plants brought from

  • Rio de Janeiro, Protocol of (South America [1942])

    Protocol of Rio de Janeiro, (1942), treaty settling possession of the disputed Oriente region on the border of Peru and Ecuador, arranged by a conference of Western Hemisphere foreign ministers held at Rio de Janeiro. Peruvian forces had occupied the area in 1941, defeating the poorly equipped

  • Río de la Laja (river, Mexico)

    Laja River, river in Guanajuato estado (state), north-central Mexico. After rising in the Sierra Madre Occidental near San Felipe (Doctor Hernandez Alvarez), the Laja arches eastward and then southeastward through the central plateau, past the cities of Dolores Hidalgo, San Miguel de Allende,

  • Río de la Plata craton (geology)

    South America: Geologic history: …Luis Alves, Alto Paraguay, and Río de la Plata—represent the Precambrian core of South America, and (with the exception of the Alto Paraguay craton) those now appear as upwarped massifs arrayed from north to south in the immense eastern portion of the continent; a number of other Precambrian crustal blocks…

  • Río de la Plata, United Provinces of the (historical state, Latin America)

    Buenos Aires: The independent capital: …was named capital of the United Provinces of the Río de la Plata. The more distant provinces of the former viceroyalty—Bolivia, Uruguay, and Paraguay—refused to become part of a new country dominated by the port city, however. For nearly 30 years, the provinces were held together by federalism, which meant…

  • Río de la Plata, Viceroyalty of the (historical area, South America)

    Viceroyalty of the Río de la Plata, the final of the four viceroyalties that Spain created during its colonization of Central and South America. Including the territory now comprising Argentina, Uruguay, Paraguay, and Bolivia, the new viceroyalty (established in 1776) controlled an area previously

  • Río de Oro (region, Western Sahara, Africa)

    Río de Oro, southern geographic region of Western Sahara, northwest Africa. It has an area of 71,000 square miles (184,000 square km) and lies between Cape Blanco and latitude 26° N, near Cape Bojador. The climate is very arid, with virtually no precipitation, and there are extreme variations of

  • Rio Declaration (international agreement)

    common but differentiated responsibilities: …international legal texts include the Rio Declaration, where it is enunciated as “Principle 7,” and the United Nations Framework Convention on Climate Change, together with its 1997 Kyoto Protocol. It was retroactively incorporated into the Vienna Convention and Montreal Protocol on substances that destroy the ozone layer. Practically, it entails…

  • Río Deseado (river, Argentina)

    Deseado River, river in southern Argentina, rising in Lake Buenos Aires in the Andes of southern Chile and Argentina. It flows generally eastward and southeastward through Santa Cruz province. Near Koluel Kayke and Jaramillo it sometimes disappears into the dry soils of Patagonia, but it reemerges

  • Rio Doce (river, Brazil)

    Doce River, river, eastern Brazil, formed by the junction of the Carmo and Piranga rivers in southeastern Minas Gerais state. Flowing northeastward to Governador Valadares, southeastward to Colatina, and thence eastward across the coastal plain of Espírito Santo state, it empties into the Atlantic

  • Río Ebro (river, Spain)

    Ebro River, river, the longest in Spain. The Ebro rises in springs at Fontibre near Reinosa in the Cantabrian Mountains, in the Cantabria province of northern Spain. It flows for 565 miles (910 km) in a southeasterly course to its delta on the Mediterranean coast in Tarragona province, midway

  • Río Fuerte (river, Mexico)

    Fuerte River, river in northwestern Mexico, formed in Chihuahua state by the junction of the Verde and Urique rivers, and descending generally southwestward through Sinaloa state from the Sierra Madre Occidental to the Gulf of California, 27 miles (43 km) west of Los Mochis at Lechuguilla Island.

  • Río Gallegos (Argentina)

    Río Gallegos, city, capital of Santa Cruz provincia (province), extreme southern Argentina. It lies on the southern (right) bank of the estuary of the Gallegos River, inland from the Atlantic Ocean, about 40 miles (65 km) north of the Strait of Magellan. Founded in 1885, it was named for Blasco

  • Río Garona (river, Europe)

    Garonne River, most important river of southwestern France, rising in the Spanish central Pyrenees and flowing into the Atlantic by way of the estuary called the Gironde. It is 357 miles (575 km) long, excluding the Gironde Estuary (45 miles in length). Formed by two headstreams in the Maladeta

  • Rio Grande (American railway)

    Denver and Rio Grande Western Railroad Company (D&RGW), former American railroad chartered in 1870 as the Denver and Rio Grande Railway (D&RG). It began with a narrow-gauge line extending from Denver, Colorado, south to New Mexico and west to Salt Lake City, Utah. Conversion to standard-gauge track

  • Rio Grande (river, Brazil)

    Grande River, river, south-central Brazil. It rises in the Mantiqueira Mountains almost in sight of Rio de Janeiro city and descends inland, west-northwestward, in many falls and rapids. Its lower course marks a portion of the Minas Gerais–S?o Paulo border. At the Mato Grosso do Sul state border,

  • Rio Grande (river, United States-Mexico)

    Rio Grande, fifth longest river of North America, and the 20th longest in the world, forming the border between the U.S. state of Texas and Mexico. Rising as a clear, snow-fed mountain stream more than 12,000 feet (3,700 metres) above sea level in the Rocky Mountains, the Rio Grande descends across

  • Rio Grande (Brazil)

    Rio Grande, port city, southeastern Rio Grande do Sul estado (state), southern Brazil. The city lies along the Rio Grande (river), which is the outlet to the Atlantic Ocean of the Patos Lagoon. It is built on a low peninsula, barely 5 feet (1.5 metres) above sea level and 8 miles (13 km) from the

  • Rio Grande (film by Ford [1950])

    John Wayne: …a Yellow Ribbon (1949), and Rio Grande (1950), three elegiac films in which Wayne portrays stoic cavalry officers of the Old West. Wayne’s roles in these and other films for Ford offer a somewhat complex representation of the American character in that they exhibit unflagging patriotism but are disillusioned by,…

  • Rio Grande Compact (Mexico-United States [1939])

    Rio Grande: The economy: …Mexico, as well as the Rio Grande Compact (1939) among Colorado, New Mexico, and Texas, concerning shared use of the waters of the upper Rio Grande subbasin (above the site of former Fort Quitman, Texas), and the Pecos River Compact (1948) between New Mexico and Texas, concerning the Pecos above…

  • Río Grande de Arecibo (river, Puerto Rico)

    Arecibo River, river in west-central Puerto Rico. The Arecibo River rises in the Cordillera Central just east of Mount Guilarte. It flows north-northeast about 40 miles (65 km) through a coffee-growing region and descends across the northern coastal plain to empty into the Atlantic Ocean just e

  • Río Grande de Cagayan (river, Philippines)

    Cagayan River, longest stream in Luzon, Philippines. It begins its 220-mile (350-kilometre) course in a twisting pattern in the Sierra Madre in northeastern Luzon. It then flows north into a 50-mile- (80-kilometre-) wide fertile valley that is important for the cultivation of rice and tobacco. I

  • Río Grande de Loíza (river, Puerto Rico)

    Loíza River, river in eastern Puerto Rico, rising in the Sierra de Cayey south of San Lorenzo. Flowing about 40 miles (65 km) between the humid foothills of the Cayey and the Sierra de Luquillo, it emerges through swamps to empty into the Atlantic Ocean near Loíza Aldea. In its floodplain and on

  • Río Grande de Pampanga (river, Philippines)

    Pampanga River, river on Luzon Island, Philippines, rising in several headstreams in the Caraballo Mountains and flowing south for about 120 miles (190 km) to empty into northern Manila Bay in a wide, swampy delta. The Candaba Swamp, covering more than 200 square miles (500 square km) when f

  • Río Grande del Norte (river, United States-Mexico)

    Rio Grande, fifth longest river of North America, and the 20th longest in the world, forming the border between the U.S. state of Texas and Mexico. Rising as a clear, snow-fed mountain stream more than 12,000 feet (3,700 metres) above sea level in the Rocky Mountains, the Rio Grande descends across

  • Rio Grande do Norte (state, Brazil)

    Rio Grande do Norte, estado (state) of northeastern Brazil. A primarily agricultural and salt-producing state and one of the smallest of all Brazilian states, it is bounded by the Atlantic Ocean on the north and east, by the state of Ceará on the west, and by the state of Paraíba on the south. The

  • Rio Grande do Sul (state, Brazil)

    Rio Grande do Sul, southernmost estado (state) of Brazil, bordered by the state of Santa Catarina (north), Argentina (west), Uruguay (south), and the Atlantic Ocean (east). The capital of Porto Alegre is the state’s main industrial area and port. Rio Grande do Sul is a major agricultural and

  • Rio Grande Rise (aseismic ridge, Atlantic Ocean)

    aseismic ridge: The Walvis Ridge and Rio Grande Rise originated from hot spot volcanism now occurring at the islands of Tristan da Cunha 300 kilometres (about 190 miles) east of the crest of the Mid-Atlantic Ridge. The Walvis Ridge trends northeast from this location to the African margin. The Rio Grande…

  • Río Guadiana (river, Europe)

    Guadiana River, one of the longest streams of the Iberian Peninsula, flowing generally westward through south-central Spain and southeastern Portugal to the Gulf of Cádiz in the Atlantic Ocean. The river has a drainage area of 23,455 square miles (60,748 square km), a length of 483 miles (778 km),

  • Rio Guadiana (river, Europe)

    Guadiana River, one of the longest streams of the Iberian Peninsula, flowing generally westward through south-central Spain and southeastern Portugal to the Gulf of Cádiz in the Atlantic Ocean. The river has a drainage area of 23,455 square miles (60,748 square km), a length of 483 miles (778 km),

  • Río Guainía (river, South America)

    Guainía River, in northwest South America, one of the headstreams of the Negro River (q.v.). It rises in the rain forest of eastern Colombia and flows east, then northeast and southeast, forming part of the Colombia-Venezuela border. After 400 miles (640 km), the Guainía joins the Casiquiare R

  • Río Guaviare (river, Colombia)

    Guaviare River, river, central and eastern Colombia, a major tributary of the Orinoco River. Initially known as the Guayabero River, it is formed in southwestern Meta departamento by the junction of the Tagua and the Duda rivers, which descend from the Andean Cordillera Oriental. As it flows

  • Río Guayas (river, Ecuador)

    Guayas River, river system of the coastal lowlands of Ecuador. Its eastern tributaries rise on the western slopes of the Andes and descend to drain the wet lowlands. Official usage as to how much of the system should be called the Guayas River differs; the name is certainly applied to the unified

  • Río Huallaga (river, Peru)

    Huallaga River, river in central and northern Peru. It rises in the Andes mountains just south of Cerro de Pasco and descends north-northeastward past Huánuco and Tingo María. The Huallaga carves a valley between the Cordillera Central and the Cordillera Azul and emerges into the Amazon River

  • Rio Jacuí (river, Brazil)

    Jacuí River, river, Rio Grande do Sul estado (“state”), southern Brazil. It rises in the hills east of Passo Fundo and flows southward and eastward for 280 miles (450 km), receiving the Taquari, Caí, Sinos, and Gravataí rivers near its mouth. There, at Porto Alegre, the state capital, on the

  • Rio Jari (river, Brazil)

    Jari River, river, northern Brazil, rising on the southern slopes of the Tumuc-Humac Mountains and flowing in a generally southeasterly direction for about 350 miles (560 km) to join the Amazon River at B?ca do Jari, opposite Grande de Gurupá Island. The Jari forms the border between Pará and Amapá

  • Rio Jequitin-honha (river, Brazil)

    Jequitinhonha River, river, eastern Brazil, rising in the Serra do Espinha?o, south of Diamantina, Minas Gerais estado (state), and flowing northward and then east-northeastward across the uplands. At Salto da Divisa, it is interrupted by the Cachoeira (falls) do Salto Grande (140 ft [43 m] high).

  • Rio Juruena (river, Brazil)

    Juruena River, river, west-central Brazil, rising in the Serra dos Parecis and descending northward from the Mato Grosso Plateau for 770 miles (1,240 km), receiving the Arinos River and joining the Teles Pires, or S?o Manuel, to form the Tapajós River, a major affluent of the Amazon. A h

  • Río Lempa (river, Central America)

    Lempa River, river in Central America. It rises in Guatemala near Esquipulas, crosses a corner of Honduras, and enters El Salvador at Citalá. After cutting across El Salvador’s northern mountain range, it flows eastward for over 80 miles (130 km) and then southward for 65 miles (105 km) across the

  • Río Lerma (river, Mexico)

    Lerma River, river in west-central Mexico. It rises on the Mesa Central 15 miles (24 km) southeast of Toluca and flows northwestward through the state of México, forming the short border between the states of Querétaro and Michoacán before meandering generally west-northwestward through Guanajuato.

  • Río Loa (river, Chile)

    Loa River, river, northern Chile. The longest river in Chile, it rises in the Andes at the base of Mi?o Volcano, near the Bolivian border, and flows southwest through the mountains, emerging at the oasis of Calama; it then veers westward and northward across the Atacama Desert. About 45 miles (70

  • Rio Lobo (film by Hawks [1970])

    Howard Hawks: Final films: Rio Lobo (1970), yet another variation on the formula, found Wayne supported by an odd cast that included Jennifer O’Neill and future studio head Sherry Lansing. It would prove to be Hawks’s last picture, some 45 years after he completed his first. In 1975 he…

  • Rio Madeira (river, South America)

    Madeira River, major tributary of the Amazon. It is formed by the junction of the Mamoré and Beni rivers at Villa Bella, Bolivia, and flows northward forming the border between Bolivia and Brazil for approximately 60 miles (100 km). After receiving the Abuná River, the Madeira meanders

  • Río Madre de Dios (river, South America)

    Madre de Dios River, headwater tributary of the Amazon in southeastern Peru and northwestern Bolivia. It flows from the Cordillera de Carabaya, easternmost range of the Andes, in Peru, and meanders generally eastward past Puerto Maldonado to the Bolivian border. There it turns northeastward and c

  • Río Magdalena (river, South America)

    Magdalena River, river, north-central Colombia. It rises at the bifurcation of the Andean Cordilleras Central and Oriental, and flows northward for 930 miles (1,497 km) to the Caribbean Sea. It receives the San Jorge, César, and Cauca rivers in the swampy floodplain of the northern lowlands. The

  • Río Mamoré (river, South America)

    Mamoré River, river in north-central Bolivia. It is formed by headwaters, chiefly the Grande River, which arise in Andean cordilleras and drain the Moxos (Mojos) plain, an ancient lake bed. The Mamoré meanders generally northward to the Brazilian border, at which point it is joined by the Iténez

  • Rio Maputo (river, Mozambique)

    Maputo River, river formed by the confluence in southwestern Mozambique of the Great Usutu River (flowing from Swaziland) and the Pongola River (flowing from South Africa). From the confluence it flows about 50 miles (80 km) northeastward to enter Delagoa Bay, 14 miles (23 km) south-southeast of t

  • Rio Maranh?o (river, Peru)

    Mara?ón River, headwater of the Amazon, rising in the snowcapped Andes above Lake Lauricocha in central Peru, about 100 miles (160 km) from the Pacific Ocean. It flows northwest across windswept plateaus 12,000 feet (3,650 m) high and carves a deep canyon between Andean ranges. As the Mara?ón p

  • Río Mara?ón (river, Peru)

    Mara?ón River, headwater of the Amazon, rising in the snowcapped Andes above Lake Lauricocha in central Peru, about 100 miles (160 km) from the Pacific Ocean. It flows northwest across windswept plateaus 12,000 feet (3,650 m) high and carves a deep canyon between Andean ranges. As the Mara?ón p

  • Rio Mondego (river, Portugal)

    Mondego River, largest of the exclusively Portuguese rivers, rising at 4,675 feet (1,425 m) on the northern slopes of the Estrela Mountains (Serra da Estrela) and flowing southwestward for 137 miles (220 km) to the Atlantic Ocean. It has a drainage basin of 2,615 square miles (6,772 square km). A

  • Río Motagua (river, Guatemala)

    Motagua River, river in eastern Guatemala, rising in the central highlands near Chichicastenango. The Motagua is Guatemala’s longest river, measuring approximately 250 miles (400 km). Flowing generally eastward and northeastward, it empties into Omoa Bay off the Gulf of Honduras at the Honduran

  • Río Muni (region, Equatorial Guinea)

    Equatorial Guinea: It consists of Río Muni (also known as Continental Equatorial Guinea), on the continent, and five islands (known collectively as insular Equatorial Guinea): Bioko (formerly Fernando Po), Corisco, Great Elobey (Elobey Grande), Little Elobey (Elobey Chico), and Annobón (Pagalu). Bata is the administrative capital of the mainland. Formerly…

  • Río Napo (river, South America)

    Napo River, river in northeastern Ecuador and northeastern Peru. It flows from the eastern slopes of the Andes in Ecuador and descends generally eastward to the Peruvian border. There it turns southeastward and continues through dense tropical rain forests, joining the Amazon River approximately 50

  • Río Nazas (river, Mexico)

    Nazas River, river in Durango and Coahuila states, northern Mexico. Formed in Durango by the confluence of the Oro (or Sestín) and Ramos rivers, which descend inland from the Sierra Madre Occidental and meet at El Palmito, the Nazas flows first southeast and then east-northeast to the Laguna

  • Río Negro (province, Argentina)

    Río Negro, provincia (province), south-central Argentina. It lies within the region of Patagonia and extends westward from the Atlantic Ocean to the Andes Mountains and the border with Neuquén province. Viedma, in the east, is the provincial capital. The province is crossed (northwest to southeast)

  • Río Negro (river, Argentina)

    Negro River, river, southern Argentina, whose major headstreams, the Neuquén and the Limay, rise in the Andes Mountains near the Chilean border. At Neuquén city they meet to form the Negro, which flows generally east-southeastward across northern Patagonia and empties into the Atlantic Ocean s

  • Rio Nun (river, Nigeria)

    Nun River, river in southern Nigeria that is considered the direct continuation of the Niger River. After the Niger bifurcates into the Nun and Forcados rivers about 20 miles (32 km) downstream from Aboh, the Nun flows through sparsely settled zones of freshwater and mangrove swamps and coastal

  • Río Pánuco (river, Mexico)

    Pánuco River, river in Veracruz state, east-central Mexico. Formed by the junction of the Moctezuma and Tamuín rivers on the San Luis Potosí–Veracruz state line, the Pánuco meanders generally east-northeastward past the town of Pánuco to the Gulf of Mexico about 6 miles (10 km) below Tampico. Just

  • Río Papaloapan (river, Mexico)

    Papaloapan River, river in Veracruz state, southeastern Mexico. It is formed by the junction of several rivers in Oaxaca state near the Veracruz–Oaxaca border and meanders generally northeastward for 76 miles (122 km) to Alvarado Lagoon, just south of Alvarado. Its chief headstreams include the

  • Rio Pará (river, Brazil)

    Pará River, channel of the Amazon delta and estuary of the Tocantins River. It passes to the south and east of Marajó Island, in northeastern Pará estado (state), northern Brazil. It carries a small part of the discharge of the Amazon River eastward and northward to the Atlantic Ocean, off Cape

  • Rio Paragua?u (river, Brazil)

    Paragua?u River, river, in central and eastern Bahia estado (“state”), eastern Brazil. It rises in the Diamantina Upland and flows northward and then eastward for approximately 300 miles (500 km). The river empties into Todos os Santos Bay, just below Maragogipe. It is navigable from its mouth f

  • Rio Paraiba do Sul (river, Brazil)

    Paraíba do Sul River, river, in eastern Brazil, formed by the junction of the Paraibuna and Paraitinga rivers, east of S?o Paulo, between Mogi das Cruzes and Jacareí. It flows east-northeastward, receiving tributaries from the Serra da Mantiqueira and the Serra do Mar and forming part of the border

  • Río Paraná (river, South America)

    Paraná River, river of South America, the second longest after the Amazon, rising on the plateau of southeast-central Brazil and flowing generally south to the point where, after a course of 3,032 miles (4,880 km), it joins the Uruguay River to form the extensive Río de la Plata estuary of the

  • Rio Paraná (river, South America)

    Paraná River, river of South America, the second longest after the Amazon, rising on the plateau of southeast-central Brazil and flowing generally south to the point where, after a course of 3,032 miles (4,880 km), it joins the Uruguay River to form the extensive Río de la Plata estuary of the

  • Rio Paranaíba (river, South America)

    Paranaíba River, south central Brazil, rising on the western slopes of the Serra da Mata da Corda and flowing west-southwestward for about 600 mi (1,000 km); it collects eight sizable tributaries along its course to join the Grande River and form the Paraná River. The river constitutes the border b

  • Rio Paranapanema (river, Brazil)

    Paranapanema River, river, rising south of S?o Paulo in the Serra do Paranapiacaba, southeastern Brazil, and flowing in a west-northwesterly direction for 560 mi (900 km) before entering the Paraná River at P?rto S?o José. After receiving the Itararé, it forms part of the S?o Paulo–Paraná estado

  • Rio Parnaíba (river, Brazil)

    Parnaíba River, river, northeastern Brazil, rising in the Serra da Tabatinga and flowing north-northeastward for 1,056 mi (1,700 km) to empty into the Atlantic Ocean, forming a delta at its mouth. In addition to marking the border between the states of Maranh?o and Piauí, the Parnaíba has great

  • Rio Paru (river, Brazil)

    Paru River, river, northern Brazil, rising on the southern slopes of the Tumuc-Humac Mountains, on the Suriname border, and flowing for about 500 miles (800 km) south-southeastward through Pará state. It empties into the lower Amazon River just above Almeirim. The Paru is navigable for 50 miles (80

  • Río Patuca (river, Honduras)

    Patuca River, river in northeastern Honduras, formed southeast of Juticalpa by the merger of the Guayape and Guayambre rivers. It flows northeastward for approximately 200 miles (320 km), emerging from the highlands and crossing the Mosquito Coast to empty into the Caribbean Sea at Patuca Point. N

  • Rio Pelotas (river, Brazil)

    Pelotas River, river in southern Brazil, rising on the western slope of the Serra Geral at Alto do Bispo in Santa Catarina estado (state), on the Atlantic coast. It arches northwestward across the uplands for approximately 280 miles (450 km) before receiving the Canoas River and becoming the

  • Río Pilcomayo (river, South America)

    Pilcomayo River, chief western tributary of the Paraguay River, south-central South America. It rises in the eastern Andes Mountains in Bolivia and flows in a southeasterly direction through the Gran Chaco plains of Paraguay to join the Paraguay River opposite Asunción, after a course of 1,550

  • Río Pilcomayo National Park (park, Argentina)

    Formosa: Río Pilcomayo National Park, with an area of some 190 square miles (500 square km), abuts the Pilcomayo River near the confluence of the Paraguay River; large numbers of indigenous Indians live within the park, which has a rich collection of fauna including the maned…

  • Río Polochic (river, Guatemala)

    Polochic River, river in eastern Guatemala. Its major headstreams arise in the Chamá and Minas mountain ranges. Flowing eastward for 150 miles (240 km), it forms a delta in Lake Izabal, south of the town of El Estor. The Polochic is navigable as far upstream as Panzós; its principal cargo traffic

  • Rio Prêto (Brazil)

    S?o José do Rio Prêto, city, in the highlands of northwestern S?o Paulo estado (state), Brazil. It lies 1,558 feet (475 metres) above sea level near the headwaters of the Prêto River. Originally called Rio Prêto, the city became a seat of a municipality in 1894 and grew as a service centre for an

  • Río Purús (river, South America)

    Purus River, river that rises in several headwaters in southern Ucayali department, Peru. It flows in a generally northeasterly direction through the rainforests of Peru and Acre state, Brazil. Entering Amazonas state, Brazil, the Purus meanders sluggishly northward, eastward, and northeastward to

  • Rio Ruo (river, Africa)

    Ruo River, largest tributary of the Shire River of southern Mala?i and Mozambique. Rising on the slopes of the Mulanje Mountains, it flows south to Mulanje town, where it veers southwest, forming 80 miles (130 km) of the Mala?i-Mozambique border before entering the Shire River at Chiromo. The R

  • Río Salado (river, Mexico)

    Salado River, river in northeastern Mexico. It rises in the Sierra Madre Oriental in Coahuila state and flows generally east-northeastward for some 175 miles (280 km) into the lake created by the Venustiano Carranza Dam at Don Martín. Leaving the reservoir, the Salado, joined by the Sabinas River,

  • Río Salado (river, Buenos Aires, Argentina)

    Salado River, river in northeastern Buenos Aires province, Argentina. It rises at Lake El Cha?ar, which lies at an elevation of 130 feet (40 metres) above sea level on the border of Santa Fe province. The river flows through the Pampas generally southeastward for approximately 400 miles (640 km) to

  • Río Salado, Battle of (Spanish history)

    Battle of Río Salado, (October 30, 1340), battle fought by the allied Castilian and Portuguese Christian forces against the Muslim Marīnids of North Africa in a final attempt by the latter to invade the Iberian Peninsula. The battle, which interrupted a series of disputes between the Castilian and

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