 It is the primary trail and extends from the north boundary near Big Lake to where it leaves the wilderness at its southern boundary near the Dee Wright Observatory.Described by Wuerthner (2003) as a "rocks and ice wilderness," much of the Mount Washington Wilderness consists of lava flows and rubble.However, it does include some forested areas with stands of lodgepole pine, and there are 28 lakes in the northern and southwestern parts of the space.