Columbia Plateau

Columbia Plateau

also called  Columbia Intermontane,  
 geographic region, northwestern United States. It forms part of the intermontane plateaus and is bordered east by the Northern Rocky Mountains and west by the Sierra Nevada–Cascade region. The plateau covers an area of about 100,000 square miles (260,000 square km) in Washington, Oregon, and Idaho and is noted for its diverse landforms (see video—>). It is uniformly covered with basaltic lava flows, but significant warping and faulting have caused elevations to range from 200 to 5,000 feet (60 to 1,500 m) above sea level. The climate is semiarid, and vegetation is limited mostly to shrubs and grasses. The Columbia and Snake rivers drain the region.

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Universalium. 2010.

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  • Columbia Plateau (ecoregion) — This article is about the ecoregion designated by the United States Environmental Protection Agency. For the associated geographical feature, see Columbia River Plateau. Columbia Plateau Ice Age floods cut coulees into the basalt of the channeled …   Wikipedia

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  • Columbia Plateau — geographical name plateau E Washington, E Oregon, & SW Idaho in Columbia River basin …   New Collegiate Dictionary

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  • Columbia River Basalt Group — The Columbia River Basalt Group (including the Steen and Picture Gorge basalts) extends over portions of five states. The Columbia River Basalt Group is a large igneous province that lies across parts of the Western United States . It is found in …   Wikipedia

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