The lake Großer Alpsee is situated in the region Allgäu, northwest of the town Immenstadt. It is the biggest natural lake in the area and a popular place for bathing, swimming, sailing and surfing.
Next to Bühl visitors can find a nice beach promenade and a lawn for sunbathing. There are other suitable places for bathing, for example close to Trieblings and next to the Road B308. Several times a year sailing regattas take place on the lake.
The lake Großer Alpsee is 3,28 km long, has a latitude of 1 km and a total area of 2,47 km². Its deepest point lays 22,7 m under the water surface. The lake is mainly fed by the river Konstanzer Ach, but several other rivers provide water. There is a smaller lake in the west of Großer Alpsee, lake Teufelssee, and in the east we find lake Kleiner Alpsee.