Rottachsee, reservoir in the district of Oberallgäu, Bavaria, Germany
Rottachsee is a reservoir in the Oberallgäu region near Sulzberg. The body of water features shallow swimming areas, water sports opportunities including sailing and windsurfing, and a nearly 10-mile walking and biking trail that circles the entire lake while passing through open fields, grassy banks, and small wooded sections.
Rottachsee was created as an artificial reservoir in 1992 to balance water flow between the Iller river and the Danube during dry and rainy seasons. This construction made it one of Bavaria's youngest dams and transformed how the region manages its water supply.
The name Rottachsee comes from the Rottach river that feeds the reservoir. Today it serves as a gathering place where locals and visitors spend time together by the water and experience the seasonal changes throughout the year.
The area is accessible by car with parking available near the water. The flat paths around the reservoir are suitable for all ages, though dogs may only swim in the Bisseroy inlet and must remain leashed everywhere around the lake.
The reservoir reaches depths of up to 35 meters and was built in a landscape shaped by the last Ice Age. This geology created small islands and shallow zones with fine sand that now provide habitat for birds, insects, and other wildlife.
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