“…1 for geographical locations) and confirm the glacial overprint of the lake's surroundings (Gasser 2003). Two main theories concerning the lake's origin and evolution prevail: Gasser (2003) suggests a mainly glacial origin of the lake whereas Kopp (1960) and Thuro et al (2006) contend the lake to be the product of the postglacial, prehistoric Oberarther Bergsturz, which reportedly was able to dam a former river that was discharging into Lake Zug in the west. Lake Lauerz has a surface area of 3 km 2 and occupies a NW-SE trending trough, with two main basins that are divided by a ridge (Fig.…”