The Sky Islands region, also known as the Madrean Archipelago, extends from the New Mexico and Arizona in the United States through the Northern Mexican states of Sonora and Chihuahua, and includes the Sonoran and Chihuahuan deserts. Peaks as high as 10,000 feet (3,200 meters) rise from the desert floor, and contain diverse and isolated ecosystems similar to those found in the Colorado Rockies and other high-altitude regions. The Sky Islands also provide a welcome summer refuge for Southern Arizona residents who want to escape the suffocating heat of the desert floor. Popular recreational activities include hiking, mountain biking, rock climbing, hunting, and birding.