TheSierra Blanca(Spanish:White Mountains) is a range ofvolcanicmountains inLincolnandOterocounties in the south-central part of theU.S. stateofNew Mexico. The range is about 40 miles (64km) from north to south and 20 miles (32km) wide.

Sierra Blanca Peak (White Peak)is the highest mountain in the range at 11,981 feet (3,652m).It is southern New Mexico’s highest peak, as well as the mostprominent(5,533 feet) and the 40th highest in the entire state.It is also the most southerly peak and land area to exceed 11,000 feet in the continental United States (Only 19 feet shy of being the most southerly area above 12,000 feet). The peak is located on theMescalero Apache Indian Reservation, approximately 10 miles (16km) west-northwest ofRuidosoand 30 miles (48km) north-northeast ofAlamogordo.