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 with 727 km² the largest of its kind in the state of Tyrol.
The up to 133 m deep Achensee is the largest lake in Tyrol. It has excellent water quality (almost drinking water level) with up to ten meters of visibility under water. Its water temperature is correspondingly low as a mountain lake and hardly exceeds 20 ° C. The Achensee is sometimes referred to as the Tyrolean Sea due to its size and the ideal wind conditions for sailors and surfers.
Riverside locations are the holiday resorts of Pertisau, Haus Seespitz, Maurach and Buchau in the south and the municipality of Achenkirch with the districts Scholastika and Achenseehof (lido) in the north.