Trigo Mountains Wilderness was created in 1990.
The area of Trigo Mountains Wilderness is 122.62 square kilometers.
Sylvania Mountains Wilderness was created in 1994.
Whipple Mountains Wilderness was created in 1994.
Cabinet Mountains Wilderness was created in 1964.
Mission Mountains Wilderness was created in 1975.
Sawtooth Mountains Wilderness was created in 1994.
Birkhead Mountains Wilderness was created in 1984.
Gates of the Mountains Wilderness was created in 1964.
Old Woman Mountains Wilderness was created in 1994.
El Paso Mountains Wilderness was created on 1994-10-31.
Beaver Dam Mountains Wilderness was created on 1984-08-28.
The area of Sylvania Mountains Wilderness is 75.603 square kilometers.