The San Andres Mountains are a mountain range located in southern New Mexico, USA. They stretch approximately 30 miles and are part of the larger Rocky Mountains system. The range is known for its rugged terrain, diverse ecosystems, and unique geological features, including volcanic rock formations. The highest peak in the San Andres Mountains is Sierra Blanca, which rises to an elevation of about 9,000 feet. The area is popular for outdoor activities such as hiking, birdwatching, and wildlife observation. It is also home to various plant and animal species, making it an important ecological region.