Mummelsee, Cirque lake in Black Forest, Germany
Mummelsee is a mountain lake in the Black Forest that sits in a bowl-shaped depression surrounded by steep slopes. The water stretches about 800 meters around its perimeter and drops to roughly 17 meters at its deepest point.
The basin formed during the last ice age when glaciers carved into the rock and then melted away, leaving this hollow behind. It is one of only seven remaining cirque lakes in the Black Forest and represents a rare remnant of that ancient period.
Local stories speak of water spirits and legendary figures living in the lake, and these tales still shape how visitors experience the place today. Artistic depictions around the water keep these old narratives alive and add to what makes this location feel different from other lakes.
Visitors can rent pedal boats, walk the shoreline paths, or take a bus service up to the Hornisgrinde viewpoint. The best time to visit is from May through October when the trails are clear and facilities are fully available.
The Hornisgrinde mountain rises steeply from above the lake and dominates the landscape as the highest peak in the Northern Black Forest region. From its summit, the entire lake basin and surrounding ridge system spread out in full view below.
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