The Achensee forms the border between the Karwendel Mountains in the west and the Brandenberger Alps in the east. It is up to 133 meters deep and the largest lake in Tyrol. By the way, with excellent water quality. Reason enough to get to know the beautiful lake. This hike takes you around, almost exclusively along the shore.Starting point is at the Hotel Fürstenhaus in Pertisau. You start your hike counterclockwise, but of course you can also go the other way. With its 22 kilometers, the tour is not without, but you have to master only a few vertical meters on the way. And the unique views of the azure blue waters of the Achensee reward for every kilometer covered.You walk along the Seepromenande with its observation tower and reach after about three kilometers Seespitz. Maybe you are lucky and you are just entering the Achenseebahn in the final stop. Continue along the shore to Buchau. Here you can sit down for a break and enjoy the view of the opposite Pertisau and the surrounding mountains.The next section is entertaining: on the so-called Wusel-Seeweg to Achenkirch 16 fun play stations are waiting for you. So the tour is also varied for children. Having arrived in Achenkirch, you have earned a long break. If you are interested in the history of the region, it is worth visiting the Heimatmuseum Sixenhof.With renewed energy, you will start into the last third of the circumnavigation of the lake - and that will once again make a real difference in the landscape. The narrow path meanders along the steep bank, up stairs and under ledges. Enjoy this beautiful stretch of road, soon you have reached Pertisau again.If the entire route is too long for you, then you also have the option to shorten it by boat. You wander past several moorings. The current timetable and all other information can be found here: tirolschiffahrt.com/fahrplanlinie.