Sylvania Mountains Wilderness was created in 1994.
The area of Sylvania Mountains Wilderness is 75.603 square kilometers.
Sylvania Wilderness was created in 1987.
The area of Sylvania Wilderness is 74.167 square kilometers.
Whipple Mountains Wilderness was created in 1994.
Cabinet Mountains Wilderness was created in 1964.
Gates of the Mountains Wilderness was created in 1964.
Birkhead Mountains Wilderness was created in 1984.
Trigo Mountains Wilderness was created in 1990.
Sawtooth Mountains Wilderness was created in 1994.
Mission Mountains Wilderness was created in 1975.
Old Woman Mountains Wilderness was created in 1994.
Beaver Dam Mountains Wilderness was created on 1984-08-28.