There are 14 National Natural Landmarks in Maine.
Name Image Date Location County Ownership Description Appleton Bog Atlantic White Cedar Stand Knox private A large peatland with continuous forest cover and well-developed hummock-and- hollow topography. Carrying Place Cove Bog Washington state A tombolo that has been eroded by the sea. Colby-Marston Preserve Kennebec private Northern sphagnum bog located in a deep kettle hole, the sphagnum mat exceeds a depth of . Crystal Bog Aroostook private An undisturbed, sphagnum bog considered one of the largest and finest in Maine. Gulf Hagas Piscataquis federal (Appalachian Trail) Waterfalls, cliffs, and growth of spruce-fir forest on the gorge walls give the site unusual scenic beauty. The Hermitage Piscataquis federal (Appalachian Trail) One of the few undisturbed, old-growth white pine stands remaining in New England. Monhegan Island Lincoln private Dense, almost pure stands of red spruce and over 400 species of wildflower. Mount Bigelow (Maine) Franklin, Somerset state Exceptionally scenic and wild, with some of the best summit views in the eastern United States. Mount Katahdin Piscataquis state (Baxter State Park) Kames, eskers, drumlins, kettleholes, moraines, and erratics provide a complete illustration of glacial geology. New Gloucester Black Gum Stand , Cumberland private A small, remnant, forested swamp dominated mostly by virgin black gum. No. 5 Bog and Jack Pine Stand Somerset state, private The only large, intermontane peatland and one of the few expansive, virgin landscapes in the northeastern United States. Orono Bog Penobscot municipal, private A classic northern sphagnum bog. Passadumkeag Marsh and Bogland Penobscot private One of the largest, unspoiled wetlands in the state of Maine. Penny Pond-Joe Pond Complex Kennebec private Kettle hole bogs and ponds.
See also
List of National Historic Landmarks in Maine