The Kuskokwim Mountains are a series of broad ridges with rounded summits reaching up to 1,350 meters in elevation. Soils are derived from wind-blow glacial sediments (loess) and colluvium. This area is unique in that the rocks are quite old and provide a different type of substrate than most other areas in the park. Wildfires are frequent in this region. Open black spruce (Picea mariana) forests are abundant, with alpine vegetation covering the broad ridges and summits. Some slopes are dominated by white spruce (Picea glauca) and/or paper birch (Betula neoalaskensis) forests.
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