Sierra Blanca (also called the
White Mountains) is a range of
volcanic mountains in
Lincoln and
Otero counties of south-central
New Mexico. It has the highest mountain in Southern New Mexico and the seventh highest peak in the state. The range is about from north to south and wide, and is dominated by
Sierra Blanca Peak (White Peak), whose highest point is at . The peak is located on the
Mescalero Apache Indian Reservation, west-northwest of
Ruidoso and 30 miles (48 km) north-northeast of
Alamogordo.