The Trollheimen Triangle traverses between three full service huts that form a triangle shape in Trollheimen ("home of the trolls") mountains, located in the middle of Norway. The huts are Gjevilvasshytta, Trollheimshytta and Jøldalshytta. The route can be run starting and ending at any of the three huts, and in any direction.

Between Trollheimshytta and Jøldalshytta, there are three trails: Svartådalen (the valley, fastest), Geithetta (over a mountain ridge) and Trollhetta (over a larger mountain, most difficult). The main route is over Geithetta.