Brunosee

The Beerenbruch nature reserve lies on the border between the two cities of Dortmund and Castrop-Rauxel. It was created around 1950 by subsidence. Here the Brunosee was created as a mountain subsidence water. Numerous water birds such as the little grebe, teal and shoveler live and breed at this lake. The lake is overgrown with reeds at its edges. These provide habitat for reed warblers and reed bunting. The Brunosee is bordered by old forest stands, some of which are 110 to 190 years old.

The "Brunosee" was created as a mountain subsidence and is located in the Beerenbruch nature reserve.
(de.wikipedia.org/wiki/Naturschutzgebiet_Beerenbruch)
The hidden lake next to the Leveringhausen bird pond (bit.ly/2oPovUy) invites you to take a long break by the water.

When too many people come at the same time on nice weekends or holidays, things get tight. There is not much space for it, there are only a few stones to sit on and there are no benches. The viewing platform was destroyed and is useless anyway, because you really only look in front of branches.