The Bruneau Sand Dunes
The Bruneau Dunes are perhaps the most bizarre natural phenomenon in the state. Trapped in a low-laying basin just south of Mountain Home, they're thought to have originated during the Ice Age, in the aftermath of the Bonneville Flood. Unlike most sand dunes, those at Bruneau don't shift dramatically with the wind. They're trapped in the basin, and the highest peak stays at about 470 feet year-round.
