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Western Selkirk Maritime Forest

Ecoregion in WA, ID

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The Western Selkirk Maritime Forest ecoregion includes the mountainous areas of the Okanogan Highlands west of the Columbia River as well as the narrow valley of the upper Pend Oreille River. Geologically, a significant portion of the region is underlain by the metasediments of the Kootenay Arc and Old Belt deposits. This ecoregion is wetter than the Okanogan Highland Dry Forest (15x) ecoregion to the west because it is influenced by marine air entering the region via the Columbia River Valley. The distribution of trees of dry habitats, such as ponderosa pine and subalpine fir, declines eastward as they are replaced by grand fir and western hemlock. An ash layer aids in soil water retention, increasing forest productivity.

— EPA

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