Owyhee County is a county in the southwestern corner of the U.S. state of Idaho. Nearly all of the county is high intermountain desert, with plentiful sagebrush and basalt canyons. The Owyhee Mountains in the west dominate the landscape, with Hayden Peak reaching 8,403 feet above sea level. The lowest elevation is at the county’s northwest corner, where the Snake River is just above 2,000 feet at the Oregon border. The Snake forms most of the county’s northern border from Oregon to just west of Glenns Ferry in Elmore County. A tributary of the Snake is the Bruneau River, which flows north from Nevada through the eastern section of the county. The Owyhee River starts in the southwestern part of the county and flows westward into Oregon; it eventually enters the Snake at the state border, south of Nyssa.