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river blindness

(Encyclopedia)river blindness or onchocerciasis, disease caused by the parasitic nematode worm Onchocerca volvulus. The worm larvae are transmitted by the bites of blackflies (genus Simulium) that live in fast movi...

Morava, river, Czech Republic and Slovakia

(Encyclopedia)Morava môrˈävä [key], Ger. March, river, c.240 mi (390 km) long, rising in the Sudetes, N Czech Republic, and flowing generally S past Olomouc into the Danube River, W of Bratislava. It is navigab...

Inn, river, Switzerland, Austria, and Germany

(Encyclopedia)Inn ĭn [key], river, c.320 mi (515 km) long, rising near the Lake of Sils, SE Switzerland. It flows NE through the Engadine valley, then through W Austria, past Innsbruck and Solbad Hall (the head of...

Dvina, river, Russia, Belarus, and Latvia

(Encyclopedia)Dvina or Western Dvina, Ger. Düna, Latvian Daugava, Rus. Zapadnaya Dvina, river, c.635 mi (1,020 km) long, in Russia, Belarus, and Latvia. Rising in the Valdai Hills, it flows S and then generally W ...

Detroit, river, United States and Canada

(Encyclopedia)Detroit, river, 32 mi (52 km) long, flowing from Lake St. Clair S into Lake Erie between Detroit, Mich., and Windsor, Ont.; it forms part of the U.S.-Canada boundary. It is one of the most heavily ind...

Negro, Río, river, Uruguay and Brazil

(Encyclopedia)Negro, Río rēˈō nāˈgrō [key], principal river of Uruguay, c.500 mi (800 km) long, rising in S Brazil and flowing SW across central Uruguay to the Uruguay River. It traverses a sheep-raising reg...

Red River, rivers, United States and Canada

(Encyclopedia)Red River. 1 River, 1,222 mi (1,967 km) long, southernmost of the large tributaries of the Mississippi River. It rises in two branches in the Texas Panhandle and flows SE between Texas and Oklahoma an...

Columbia, river, Canada and the United States

(Encyclopedia)Columbia, river, c.1,210 mi (1,950 km) long, rising in Columbia Lake, SE British Columbia, Canada. It flows first NW in the Rocky Mt. Trench, then hooks sharply about the Selkirk Mts. to flow S throug...

Smoky Hill River

(Encyclopedia)Smoky Hill River, c.560 mi (900 km) long, rising on the Great Plains, E Colo., and flowing E across Kansas to join the Republican River and form the Kansas River at Junction City. The Saline River is ...

Kootenai, river, Canada and the United States

(Encyclopedia)Kootenai ko͞oˈtĭnā [key], river, 407 mi (655 km) long, rising in the Rocky Mts., SE British Columbia, Canada. It flows S into NW Montana, NW through N Idaho, then N into Canada. There it flows thr...