Tags: Mountain Range.
For other mountain ranges named Black Mountains see: Black Mountains (disambiguation)The Black Mountains of northwest Arizona are an extensive mostly linear north-south 75-mile (121 km) long mountain range. It forms the north-south border of southwest Mohave County as it borders the eastern shore of the south-flowing Colorado River from Hoover Dam.The northwest and parts of the west of the range are located in the Lake Mead National Recreation Area.