The Wallowa National Forest, with a total area of approximately 1,097,670 acres, is located in the extreme northeastern part of Oregon. Geologically it comprises part of that great lava bed known as the Columbia river plateau which covers about 250,000 square miles of this northwest territory. This great lava plateau surrounds several prominent mountain ridges one of which, the Wallowa mountains, is included within the boundary of this forest and stands out prominently above the surface of the surrounding plateau.
Steffen, E. H.
"Range Reconnaissance on the Wallowa National Forest,"
Ames Forester: Vol. 3
, Article 3.
Available at: https://lib.dr.iastate.edu/amesforester/vol3/iss1/3