Dark water, almost a mirror of obsidian, a crown of pines climbing the slopes, and the profile of the Hornisgrinde dominating the horizon. This is how the Mummelsee presents itself, a mysterious (and legendary) lake in the Black Forest that manages to fuse nature, geological history, and popular traditions with the same intensity.
Situated at an altitude of 1,036 meters near the village of Seebach, along the famous Schwarzwaldhochstraße, the Black Forest Panoramic Road that connects Baden-Baden and Freudenstadt through some of the most spectacular landscapes in Germany, it draws thousands of visitors who come not only for the beauty of the scenery but also for the enigmatic legends that have surrounded it for centuries.
Many call it the “The Eye of the Black Forest,” a nickname born from its almost perfectly circular shape and the surface that reflects the surrounding forest with surprising clarity. On windless days it really seems that the mountain is gazing at the sky through a crystal pupil. Yet just a cloud, a change of light, or a light breeze can transform the atmosphere completely, though it still offers views that look as if they were drawn from an ancient tale.
Origin, formation and legends of the Mummelsee
The Mummelsee belongs to the glacial lakes of the Black Forest, known in German as Karsee. It is the largest of the seven glacial basins still present in the region, and among the highest. Its origin dates back roughly 10,000 years to the end of the last glacial period. Huge masses of ice slowly carved a nearly circular hollow in the mountain. As the glaciers retreated, that depression filled with water to form the lake as we know it today. Today it covers an area of 3.7 hectares, reaches about 18 meters in depth, and has a perimeter close to 800 meters.
Behind it rises the
The origin of the name Mummelsee, however, lies in popular tradition: once the surface hosted numerous white water lilies called locally Mummeln in the dialect, a term from which the lake’s name ultimately derives. As the centuries passed, that botanical explanation opened the door to more captivating tales.
According to one of the most famous legends, in its depths lies a magnificent crystal castle inhabited by the Mümmlein, elegant water nymphs of extraordinary beauty. At night they rose to the surface to dance among the trees or visited the valley farms to aid farmers and woodcutters in daily tasks or to take care of children. Before dawn they always returned to their submerged realm, obeying the orders of the lake’s ruler.
A romantic tale, instead, speaks of a love affair between a nymph and a young farmer from Seebach. The girl lingered too long with her beloved during a village celebration and came back after the allotted time. The king of the Mummelsee punished that disobedience harshly, while the young man waited by the shore for a sign of his sweetheart’s fate. Shortly after, a small crimson wave rose from the surface: the symbol of the nymph’s tragic fate, sacrificed for following her heart.
Other stories tell of the King of the Mummelsee, of spirits dwelling in the depths, and even of a direct passage to the center of the Earth. These tales have been handed down for generations and continue to fuel the fascination of this corner of the Black Forest.
What to do and see at Mummelsee
Walking around this lake in Germany is the best way to appreciate the landscape. A flat, circular trail, accessible to strollers and to people with reduced mobility, lets you complete the loop in about 20 minutes. Scenic viewpoints, glimpses of the forest, and ever-changing reflections accompany the entire route.
Along the way there is a refined bronze statue dedicated to the nymph of the Mummelsee, a tribute to the ancient legends that still define this place. Not far away there is also an open-air art path, with contemporary installations made from natural materials.
During the warmer season the lake takes on a different perspective thanks to pedal boat rentals. From the water the forest looks even more imposing, and the silence provides a feeling that is hard to describe. According to tradition, if you study the center of the lake with great care you might even glimpse the glow of the King of the Mummelsee’s castle.
Families with children will find a large playground inspired by local stories, with structures for young explorers and a ghost house of the Mummelsee that recounts the ancient legends. Nearby there are shops selling typical Black Forest products, including cuckoo clocks, crafts, liqueurs, honey, jams, and gastronomic specialties. In summer the wood-fired oven bakes traditional countryside bread according to age-old recipes, while demonstrations allow visitors to observe the processing up close.
Anyone seeking even broader panoramas can climb toward the Hornisgrinde. The trail reaches the summit in about an hour, passing through alpine meadows and forests. From the observation tower, the view encompasses much of the Black Forest, the Rhine Valley, and, on clear days, even the Vosges range in French territory.
The Mummelsee is also an important waypoint on the Westweg, the most famous hiking route in the Black Forest, recognizable by the distinctive red rhombus that guides hikers from Pforzheim to Basel.
Where it is and how to get there
The Mummelsee is located in Baden-Württemberg, at the heart of the northern Black Forest, near the municipality of Seebach. Its position along the Schwarzwaldhochstraße makes it easily reachable by car. Starting from Baden-Baden, you need roughly 40 minutes along one of Germany’s most scenic roads. Freudenstadt lies about 35 kilometers away, while Strasbourg can be reached in just over an hour by crossing the Franco-German border.
A large parking area welcomes visitors right beside the lake, a particularly convenient option for families and travelers with limited time. Between May and October, on weekends, a bus connects the Mummelsee with the Hornisgrinde observation tower, easing the ascent to the summit. Dawn, sunset, and the early morning hours bestow the most evocative atmosphere.
