Idaho

Idaho is the fourth most populous and third largest geographically of the regions of Cascadia.

Clearwater Valley

 * Lewiston
 * Dworshak Reservoir
 * Orofino

Upper Treasure Valley

 * Pocatello
 * Idaho Falls
 * Twin Falls

Boise Area

 * Boise
 * Meridian
 * Nampa
 * Caldwell

Notable Mountain Areas

 * The Bitterroots
 * Borah Peak