Columbia Plateau
Plateau in Washington, Oregon, and Idaho in the United States / From Wikipedia, the free encyclopedia
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This article is about the geographic feature. For the associated ecoregion, see Columbia Plateau (ecoregion).
The Columbia Plateau is a geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho.[1] It is a wide flood basalt plateau between the Cascade Range and the Rocky Mountains, cut through by the Columbia River.