Gosausee | Austria 

There are two lakes, Vorderer Gosausee and Hinterer Gosausee. Walking to the latter lake takes about three hours. The Gosau lakes, which are part of the Salzkammergut in the Gosau Valley in Upper Austria, consist of three bodies of water. The Vorderer and Hinterer Gosausee lakes are essentially unconnected. Both are primarily replenished by springs originating from the Dachstein glaciers beneath the water's surface..