Federsee is a lake located just north of Bad Buchau in the region of Upper Swabia in Southern Germany.

With a size of 33 km2 (8,155 acres), the area is one of the largest, groundwater fed, connected moorlands in Southern Germany.

However, the origin of its name is locally debated, with one camp defending the shape theory, and another championing the idea that the amount of feathers found on the lake's surface gave rise to its name.

The lake is encircled by the town of Bad Buchau, and the villages of Moosburg, Alleshausen, Seekirch, Tiefenbach, and Oggelshausen.

Starting near the parking area at the Federsee Museum, it leads through the reed belt until open water is reached.