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Provo, river, United States

(Encyclopedia)Provo, river, c.70 mi (110 km) long, rising in the Uinta Mts., NE Utah, and flowing SW past Provo to Utah Lake. It was early used for irrigation, but after Utah Lake was badly depleted in the 1930s, t...

Rio Grande, river, Brazil

(Encyclopedia)Rio Grande, name of several rivers of Brazil. The largest rises in S Minas Gerais state, SE Brazil, and flows c.650 mi (1,050 km) NW to the Paranaíba River, with which it forms the Paraná River. Its...

Roanoke, river, United States

(Encyclopedia)Roanoke, river, c.410 mi (660 km) long, rising in SW Va. and flowing generally southeast across the Blue Ridge Mts. and into Albemarle Sound, NE N.C. The lower river is navigable for small craft. A co...

Osage, river, United States

(Encyclopedia)Osage, river, c.360 mi (580 km) long, formed by the confluence of the Marais des Cygnes and the Little Osage rivers, W Mo. It flows NE to join the Missouri River near Jefferson City. Bagnell Dam (comp...

Oswego, river, United States

(Encyclopedia)Oswego, river, 23 mi (37 km) long, formed by the confluence of the Oneida and the Seneca rivers, central N.Y., NW of Syracuse and flowing NW to Lake Ontario at Oswego. It has been canalized and incorp...

Oka, river, Siberian Russia

(Encyclopedia)Oka, river, c.600 mi (970 km) long, rising in the Sayan Mts., Buryat Republic, S central Siberian Russia. It flows N through Irkutsk oblast to join the Angara River below Bratsk. The lower Oka valley ...

Naugatuck, river, United States

(Encyclopedia)Naugatuck, river, 65 mi (105 km) long, rising in NW Conn. and flowing S, past Waterbury, to the Housatonic River at Derby. It furnishes water power for the remaining industrial plants along its shores...

Negro, Río, river, Argentina

(Encyclopedia)Negro, Río rēˈō nāˈgrō [key], river, c.400 mi (640 km) long, formed in central Argentina by the confluence of the Neuquén and the Limay rivers, and flowing E across Río Negro prov. (N Patagon...

Ogden, river, United States

(Encyclopedia)Ogden, river, 35 mi (56 km) long, rising in the Wasatch Range in N Utah, and flowing SW to join the Weber River at Ogden. The river has been used for irrigation for nearly a century. The Ogden–Brigh...

Ohio, river, United States

(Encyclopedia)Ohio, river, 981 mi (1,579 km) long, formed by the confluence of the Allegheny and Monongahela rivers in SW Pa., at Pittsburgh; it flows northwest, then generally southwest to enter the Mississippi Ri...