The Tannheimer Bergen are part of the Allgäuer Alps. Like the surrounding areas, the mountains are built up of different types of limestone.
The peaks here are lower than the surrounding mountain groups, and therefore, the area is much less known. Kellenspitze is the highest one (2238 m). That's not to say that this ensures simple walking. Those who wish to follow the main chain, over the German-Austrian border, must prepare for steep heights and exposed trails.