Rottachsee

Beautiful lake with great cycling and hiking trails all around and many good restaurants

The Rottachsee is used for flood protection, to raise the low water levels of the Iller and Danube and to generate electricity from hydropower. For this purpose, a through-flow turbine with an output of 480 kW is operated in the hydroelectric power station. The system generates around 1.6 million kWh per year.[5] The dam has a 38 m high and 190 m long earthen dam. The dam is 70 m high. The lake and some areas of its shore, in particular the terrain of a pre-dam area near the hamlet of Bisseroy, which is separate from the rest of the lake, are used as a recreational area. The area around the reservoir is now known as a biotope because many plants and animals have settled there.
Source: Wikipedia
de.wikipedia.org/wiki/Rottachsee

Really nice there and I do not think so overcrowded. In my opinion, the Rottachsee is still such a "little tip"