Idaho Mountain Ranges by Region

Northern Idaho:

From the Canadian Border South to the Salmon River; From the Washington & Oregon Border East to the Montana Border

Western Idaho:

From the Salmon River South to the Snake River; From the Oregon Border East to Idaho-75 and US-93

Eastern Idaho:

From Idaho-75 and US-93 East to the Wyoming Border; From Montana South to the Snake River

Southern Idaho:

From the Snake River South to the Utah and Nevada Borders