[1] With a circumference of 800 meters, the Mummelsee is the largest of the seven cirque lakes in the Black Forest, the deepest at 17 m deep and the highest at 1036 m.[2] The Mummelsee has a circumference of approximately 800 m (2,625 ft) and is surrounded by steep and forested mountain slopes on its northern, western, and eastern sides.

According to statements made by the town Seebach, the name of the Mummelsee derives from the (German) vernacular term "Mummeln" used for white waterlilies (Nymphaea alba).

A bigger building that includes the hotel, two restaurants, one grocery and souvenir store, as well as a paddleboat rental is located directly near the visitors' car park.

[10] After the incident, the hotel was rebuilt in the "Schwarzwaldstil" with an increase of usable floor space from 2,385 m2 (25,672 ft2) to 3,690 m2 (39,719 ft2) and reopened on 26 March 2010.

[11] Formerly, the naturally existing trail around the lake was kept in its original state with several tight passages and obstructive tree roots.

The "Baden-Württemberg-Ticket", "Schönes-Wochenende-Ticket" and the "Konus-Ticket" (sold by the Deutsche Bahn and local bus companies) are valid to use on all these routes.