At a staggering 1,347,644 acres, the cross-state boundary Selway-Bitterroot Wilderness covers a significant portion of southwestern Montana and eastern Idaho. The Bitterroot Mountains form a rugged boundary between the states, carved by past glaciation. Idaho contains approximately 1,092,854 acres, while Montana claims about 254,790 acres. The U.S. Forest Service manages all acreage, ranging across the Nez Perce-Clearwater, Bitterroot, and Lolo national forests.

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