Intermontane
Intermontane or “intermountain” refers to the region of the American West that lies within the natural geographic boundaries formed by the Rocky Mountains, the Sierra Nevada Mountains and the Cascade Mountains. These areas are in states considered to be mountain states, but are large areas that are substantially less hilly or mountainous, differentiating them from regions like the Rocky Mountains. The states included are Idaho, Utah and Nevada, along with parts of eastern Oregon and Washington, southwestern Idaho, northwestern Montana, western Colorado and northwestern New Mexico.