The varied terrain of this ecoregion consists of steep, jagged mountain ranges, such as the Ahklun and Kilbuck, among rolling hills and broad valleys. The peaks and ridges of the tallest mountains are almost barren, and some still have horseshoe-shaped cirque glaciers. Different kinds of plants are adapted to this ecoregion's elevation zones and to the soil moisture conditions of each. Throughout the ecoregion, the diversity of lichens and tundra plants is high. A variety of birds use the assorted habitats of the area to breed. Particularly on the coasts of the Seward Peninsula and St. Lawrence Island, there are abundant populations of cliff-nesting seabirds.
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