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Sierra Valley
Sierra Valley (Washo: Mutsim yagada det deyi ) is a large mountain valley located west of the crest of California's Sierra Nevada mountain range in Plumas and Sierra Counties, north of Interstate 80.
==Geography==
An intermontaine valley at approximately elevation, Sierra Valley is surrounded by mountains ranging in elevation from 6,000 to . The huge valley, , is a down-faulted basin, formerly a lake bed of similar geologic origin to Lake Tahoe to the south, now filled with sediment up to two thousand feet thick. Average annual rainfall is less than twenty inches, most falling as snow. The valley floor has a grassland and sagebrush ecosystem and is the site of extensive freshwater marshes filled with cattails, bulrushes and alkaline flats that drain into the Middle Fork Feather River. Many species of wildlife make their permanent home in the valley, and a great number of migratory bird species stop over in the fall and nest in the valley in the spring. The valley also has thermal activity, with Marble Hot Springs located in the north central valley floor.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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