[1][2] The Teufelssee in Grunewald forest is not to be confused with the lake of the same name in the Berlin district of Köpenick.

To the north-east is Teufelsberg, an artificial hill made from heaped-up rubble of the Second World War.

To prevent the water level in the lake from dropping, groundwater is fed into Teufelssee; the groundwater feed not only supports the water balance of the Teufelssee, but also wets the adjacent Teufelsfenn moor and preserves it as a valuable biotope.

The water hygiene specialist group of the Landesamt für Gesundheit und Soziales Berlin [de] (LAGeSo) monitors bathing water quality from April to September.

Despite the existence of a toilet container, LAGeSo assumes that faeces will get into the lake from bathers.

[4] In August 2020, a photo taken by actress Adele Landauer [de] on the lake's nudist beach received global coverage.