Lobsigensee is a lake at Lobsigen in the municipality of Seedorf, Berne, Switzerland. Its surface area is 1.73 ha.On the northwestern shore there are remains of a neolithic settlement which is now part of the Prehistoric Pile dwellings around the Alps, an UNESCO World Heritage Site.The Lobsigensee UNESCO site is located on the south-western shore of the lake of the same name. Based on several finds, the site has been dated to the second half of the 4th millennium BC.