Above their base, the highest peak, Harney, having an altitude above the sea of 7216 ft.
In sharp contrast to the surrounding plains the climate is subhumid, especially in the higher Harney region.
Above the sea; the highest point is Harney Peak in the Black Hills, which rises to a eight of 7216 ft.
Upon this limestone plateau there is a central area of high ridges, among them the rough crags of Harney, Custer and Dodge peaks.
East-west, reaching an altitude in Harney Peak of 7216 ft., and an effective relief over the plains of 2000 or 3000 ft.
The Upper Sonoran life-zone comprises south-eastern Montana, central, eastern and north-eastern Wyoming, a portion of south-western South Dakota, western Nebraska and Kansas, the western extremity of Oklahoma, north-western Texas, eastern Colorado, south-eastern New Mexico, the Snake plains in Idaho, the Columbia plains in Washington, the Malheur and Harney plains in Oregon, the Great Salt Lake and Sevier deserts in Utah, and narrow belts in California, Nevada and Arizona.