The Tonto National Forest, Arizona, embraces almost 3 million acres of rugged and spectacularly beautiful country, ranging from Saguaro cactus-studded desert to pine-forested mountains beneath the Mogollon Rim. This variety in vegetation and range in altitude (from 1,300 to 7,900 feet) offers outstanding recreational opportunities throughout the year, whether it's lake beaches or cool pine forest. As the fifth largest forest in the United States, the Tonto National Forest is one of the most-visited "urban" forests in the U.S. (approximately 5.8 million visitors annually). Its boundaries are Phoenix to the south, the Mogollon Rim to the north and the San Carlos and Fort Apache Indian reservations to the east. In the winter, national and international visitors flock to Arizona to share the multi-hued stone canyons and Sonoran Desert environments of the Tonto's lower elevations with Arizona residents. In the summer, visitors seek refuge from the heat at the Salt and Verde rivers and their chain of six man-made lakes. Visitors also head to the high country to camp amidst the cool shade of tall pines and fish the meandering trout streams under the Mogollon Rim.