Intermontane Plateaus

Physiographic regions of the U.S. Interior; the Intermontane Plateaus are marked 20 (Columbia Plateau), 21 (Colorado Plateau) and 22 (Basin and Range).

In the context of physical geography, the Intermontane Plateaus is one of eight physiographic regions of the contiguous United States. The region consists mostly of plateaus and mountain ranges lying between the Rocky Mountains on the east and the Cascade and Sierra Nevada Mountains on the west. It is subdivided into three physiographic provinces: the Columbia Plateau in the north, the Basin and Range Province in the central and southwestern portions, and the Colorado Plateau in the southeast. In turn, each of these provinces are each subdivided into a number of physiographic sections.