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The Ecoregions of Idaho

There are numerous variations, depending on which agency or university made the determination.  This one, based on one from the Idaho Department of Fish and Game seems reasonable to me.  They are:

Temperate inland rain forest

Canadian Rocky Mountains

The Palouse and associated praries

Northern Rocky Mountains

      Idaho Batholith

      Challis Volcanics

      Beaverhead Mountains

      Blue Mountains Biome

Middle Rocky Mountains

      Yellowstone ecosystem

      Overthrust Mountains

Wyoming Basin

Owyhee Uplands

Snake River Plain

Northern Basin and Range