The area of Umpqua National Forest is 3,990.119 square kilometers.
Umpqua National Forest was created on 1908-07-01.
William Berlin Purdom has written: 'The geologic history of the Diamond Lake area, Umpqua National Forest, Douglas County, Oregon' -- subject(s): Geology
The area of Sawtooth National Forest is 8,498.398 square kilometers.
The area of Gallatin National Forest is 8,498.398 square kilometers.
The area of Croatan National Forest is 647.036 square kilometers.
The area of Malheur National Forest is 6,879.656 square kilometers.
The area of Umatilla National Forest is 7,284.342 square kilometers.
The area of Custer National Forest is 5,173.012 square kilometers.
The area of Inyo National Forest is 24,281.1385344 square meters.
The area of Siuslaw National Forest is 2,549.52 square kilometers.
The area of Stanislaus National Forest is 3,634.478 square kilometers.
The area of Chippewa National Forest is 6,474.97 square kilometers.