Twentyone Hill
Summit in Kalkaska County, Michigan · on the USGS Smithville quadrangle
44.56716, -85.15882
Maps that show Twentyone Hill
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Smithville, MI
Detailed map of terrain, trails and roads
USGS topo, 2023
Kalkaska, MI
Old map for history, not navigation
USGS historical 15-minute topo (1956)
Bureau of Land Management Eastern States Overview map
BLM Eastern States (2019)
IFR Enroute Low Altitude Chart L-31 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-02 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-10 (U.S.)
FAA, 2026-10-29
IFR Enroute High Altitude Chart H-12 (U.S.)
FAA, 2026-10-29
Name, class, county and location: USGS Geographic Names Information System (public domain).