Borah Peak, peak in Lost River Range in Custer county, Idaho, U.S., and—at an elevation of 12,662 feet (3,859 metres)—the highest point in the state. Borah Peak, which was named for William E. Borah, a U.S. senator from Idaho, is located in Challis National Forest, 50 miles (80 km) northeast of Hailey. The peak lies in a tectonically active district, and in 1983 it was the epicentre of an earthquake that measured 7.2 on the Richter scale.