Bayersoiener See

The Bayersoiener See – colloquially known as Soier See or Soiener See – is a 22.5-hectare lake in the Ammergau Alps. It is located in the municipality of Bad Bayersoien in the district of Garmisch-Partenkirchen in Upper Bavaria and is part of the landscape conservation area Inschutznahme des Soiener See and its surroundings, which also includes the landscape that has been created by its strong siltation, as well as the FFH area moraine landscape between Staffelsee and Baiersoien. With a volume of 448,000 cubic meters, an average depth of 1.99 meters is calculated. The maximum depth is 2.5 meters.
The Bayersoiener See is a moor lake that owes its formation to the retreat of the glaciers during the Würm Ice Age. However, the material required for the mud baths in the spa facilities of the mud spa Bad Bayersoien is not extracted from the lake. Alpine mountain pine raised bog is used for this purpose, which is mined at various bog holes in the Ammergau Alps.

Wikipedia