The Grössinsee is a protected lake with 0,94 km² in the nature park Nuthe-Nieplitz. He is situated nearby the village Blankensee, part of the town <a href="https://en.wikipedia.org/wiki/Trebbin" class="extiw" title="en:Trebbin">Trebbin</a> in the district <a href="https://en.wikipedia.org/wiki/Teltow-Fl%C3%A4ming" class="extiw" title="en:Teltow-Fläming">Teltow-Fläming</a>, state <a href="//commons.wikimedia.org/wiki/Brandenburg" title="Brandenburg">Brandenburg</a>, Germany.
<a href="//commons.wikimedia.org/wiki/User:Lienhard_Schulz" title="User:Lienhard Schulz">Lienhard Schulz</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>