Cenozoic Volcanism in the Cascade Range and Columbia Plateau , Southern Washington and Northernmost Oregon -- Swanson, et.al., 1989, AGU Field Trip Guidebook The Columbia Plateau is the huge, parched expanse covering Washington, Oregon, and Idaho between the Cascade Range to the west and Idaho's Rockies to the Twenty organizations partnered to produce resource cards for environmental education in the Columbia Plateau ecoregion. more> (external site) The Columbia Plateau , also known as the Columbia Basalt Plain, is the prominent geographic feature of the interior Columbia River Basin. The Columbia Plateau is a geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho.
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