| Orinoco River |
a major river of South America that starts near the Venezuelan border with Brazil, flows across Venezuela, then along the border with Colombia, and finally empties into the Atlantic Ocean. |
| Paraguay River |
a large river in South America that begins in southwestern Brazil, flows through Paraguay and along its border with Argentina, finally joining the Paraná River at the southwestern tip of Paraguay. |
| Paraná River |
a major river in South America originating in Brazil and flowing mostly south, forming the border between Paraguay and Argentina and eventually merging with the Uruguay River to form the Río de la Plata. |
| pink river dolphin |
a large South American freshwater dolphin, having a pink, light blue, or gray color, a long, thin snout, and a bulbous forehead. |
| river basin |
the area of land from which a river and its tributaries drain water. |
| river horse |
a hippopotamus. |
| Thu Bon River |
a river that flows from the western mountainous areas of Vietnam to the East China Sea, by way of the city of Hôi An. |
| Tigris River |
a river that begins in eastern Turkey and flows through Syria and Iraq. In southeastern Iraq, the river joins the Euphrates River and eventually empties into the Persian Gulf. |
| up the river |
(slang) in or to a prison. |
| Urubamba River |
a Peruvian river that flows northward from the Andes in southern Peru. |
| Volga River |
a major river, the longest in Europe, flowing through central Russia and emptying into the Caspian Sea. |
| Yangtze River |
see "Chang Jiang River." |
| Yellow River |
a major river originating in the mountains of western China and flowing mostly eastward toward the Bohai Sea; Huang He River. |
| Yenisei River |
a major river, located primarily in Russia, that originates in the mountains of Mongolia, flows north through Siberia, and empties into the Kara Sea, a part of the Arctic Ocean. |
| Yukon River |
a river that flows from the Yukon territory in Canada through central Alaska to the Bering Sea. |
| Zambezi River |
a major river in southern Africa that flows through Zambia, Angola, and Mozambique before emptying into the Indian Ocean. It also touches the borders of Namibia and Botswana and flows along the border between Zambia and Zimbabwe. |