Gila Wilderness was designated the world's first wilderness area on June 3, 1924. Along with Aldo Leopold Wilderness and Blue Range Wilderness, the 558,014 acres (225,820 ha) wilderness is part of New Mexico's Gila National Forest. The wilderness is approximately 27 miles (43 km) from north to south and 39 miles (63 km) east to west. The Gila Wilderness is located in southwest New Mexico, north of Silver City and east of Reserve. It contains the West Fork, Middle Fork and much of the East Fork of the Gila River.
The U.S. Forest Service describes the climate of the Wilderness area as "four gentle seasons." The lower elevations below 7,000 feet (2,100 m) are accessible all year with heavy winter snow uncommon. Elevation moderates the high summer temperatures of the surrounding Chihuahua Desert. May and June are the hottest and dryest months.
Vegetation in the Gila Wilderness consists of a spruce-fir and quaking aspen forest above 9,000 feet (2,732 m), ponderosa pine forest between 6,500 feet (1,981) and 9,000 (2,732 m), and pinyon-juniper woodland and desert vegetation below 6,500 feet and on dry southern slopes.
Gila is home to predators such as the bobcat and cougar. Mule deer, white-tailed deer and pronghorn are all found in the wilderness. Other mammals include the black bear, collared peccary, gray fox and white-nosed coati.
According to en.wikipedia