The Achensee is located north of Jenbach in Tyrol, 380 m above the Inn Valley. The lake is located in the Karwendel Nature Park, which has been a nature reserve since 1928 and, at 727 km², is the largest of its kind in the state of Tyrol.
The Achensee is the largest lake in Tyrol, up to 133 m deep. It has excellent water quality (almost drinking water level) and visibility of up to ten meters underwater. Its water temperature is low for a mountain lake and hardly exceeds 20 °C. Due to its size and the optimal wind conditions for sailors and surfers, the Achensee is sometimes called Tyrolean Sea designated.
The lakeside towns are the holiday resorts of Pertisau, Haus Seespitz, Maurach and Buchau in the south and the municipality of Achenkirch with the districts of Scholastika and Achenseehof (beach resort) in the north.
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