Answer:The Plateau culture area comprises a complex physiographic region that is bounded on the north by low extensions of the Rocky Mountains, such as the Cariboo Mountains; on the east by the Rocky Mountains and the Lewis Range; on the south by the Blue Mountains and the Salmon River (excepting a narrow corridor to present-day California); and on the west by the Canadian Coast Mountains and the Cascade Range. It includes the watersheds of the Columbia and Fraser rivers.
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