A mountainous sub-region in the Central Washington Cascades, bounded by Skykomish River (Highway-2), Miller River, Taylor River, Middle Fork Snoqualmie River, and Main Fork Snoqualmie River. The central area is drained by Tolt River. Notable landforms include Mt. Persis, Mt. Index, Mt. Phelps, Lennox Mountain, Bessemer Mountain, Mt. Si, and Mt. Teneriffe.
Mt Index: Main Peak via Persis–Index Ridge + Mt Persis (Taylor-Tolt Mountains, WA)
Trip Date: May 19, 2002 Mount Index Day Climb Persis TarnsMount Persis (5464 ft)Persis–Index RidgeMount
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