The Black Mountains, a mid-Miocene formation, in Nevada are a series of rugged, arid rocky volcanic mountains ranging in elevations to 3310 ft. The range lies on the north shore of Lake Mead, at the southwest corner of the Overton Arm, about 25 mi south of Overton, Nevada. The Black Mountains are mostly within the Lake Mead National Recreation Area, with a small valley bordering north, the Bitter Spring Valley at the southeast of the arid Muddy Mountains