Where was The Mountain Men filmed?

1980 film by Richard Lang

The Mountain Men (1980) was filmed in Yellowstone National Park, Grand Teton National Park, Shoshone National Forest and Bridger–Teton National Forest, 4 places named in its Wikipedia article's Production section, in the United States. Wikidata records no filming location for it at all, so the article is the only recorded source. Each place says where its claim comes from.

See them on the map → Wikipedia Source data