El Pinacate y Gran Desierto de Altar Biosphere Reserve is a Biosphere Reserve and UNESCO World Heritage Site. It is in the Sonoran Desert just below the border of Arizona, and north of the city of Puerto Peñasco (Rocky Point). It is one of the most significant visible landforms in North America seen from space. A volcanic system is the main part of the landscape, including three peaks, the main one being the Pinacate Volcano. In the area there are over 540 species of plants, 40 species of mammals, 200 of birds, 40 of reptiles, also amphibians and freshwater fishes. There are threatened endemic species such as the Sonoran Pronghorn, Bighorn Sheep, Gila Monster and the Desert Tortoise. The extension of the Biosphere Reserve is greater than that of the Mexican states of Aguascalientes, Colima, Morelos and Tlaxcala separated.