Lake Achensee is the largest lake in Tyrol and its location could not be more idyllic Nestled between the Karwendel and Rofan mountains, it is worth boarding a boat here, either to take a round trip or to cover part of the way on the water.Six landing stages invite you to explore: Pertisau, Seespitz, Buchau, Achenseehof, Scholastika and the Gaisalm. The latter is located on the western shore of Lake Achensee and can only be reached on foot or by boat.