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The 107,500-square-mile (278,000 km 2) [5] Snake River watershed drains about 87 percent of the state of Idaho, 18 percent of Washington and 17 percent of Oregon, in addition to small portions of Wyoming, Utah and Nevada. [38]
The Washington cities of Spokane, Yakima and Pasco, and the Oregon city of Pendleton, lie on the Columbia Plateau. The Columbia Plateau is an important geologic and geographic region that lies across parts of the U.S. states of Washington, Oregon, and Idaho. [1]
The Cascadia Bioregion encompasses all of the state of Washington, all but the southeastern corner of Idaho, and portions of Oregon, California, Nevada, Utah, Wyoming, Montana, Alaska, Yukon, and British Columbia. Bioregions are geographically based areas defined by land or soil composition, watershed, climate, flora, and fauna.
Overview of Oregon river drainage basins. This is a partial listing of rivers in the state of Oregon, United States. This list of Oregon rivers is organized alphabetically and by tributary structure. The list may also include streams known as creeks, brooks, forks, branches and prongs, as well as sloughs and channels.
Listed in order going downstream: British Columbia: . Headwaters to the Canada–United States border: . Canal Flats; Fairmont Hot Springs; Windermere; Invermere; Radium Hot Springs ...
The Pacific coast of Westport. Washington is the northwesternmost state of the contiguous United States.It borders Idaho to the east, bounded mostly by the meridian running north from the confluence of the Snake River and Clearwater River (about 117°02'23" west), except for the southernmost section where the border follows the Snake River.
The ecoregion extends across a wide swath of the Columbia River Basin from The Dalles, Oregon to Lewiston, Idaho to Okanogan, Washington near the Canada–U.S. border. It includes nearly 500 miles (800 km) of the Columbia River, as well as the lower reaches of major tributaries such as the Snake and Yakima rivers and the associated drainage basins.
The Treasure Valley is a valley in the western United States, primarily in southwestern Idaho, where the Payette, Boise, Weiser, Malheur, and Owyhee rivers drain into the Snake River. It includes all the lowland areas from Vale in rural eastern Oregon to Boise, and is the most populated area in Idaho.