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.