The Barmsee is a maximum of 1.12 km long and a maximum of 0.49 km wide lake in the district of Garmisch-Partenkirchen (Upper Bavaria) in the territory of the municipality Krün north of Mittenwald.

The sheltered location and its relatively large water depth mean that in spring and autumn there is no complete mixing of the deeper water layers - it is a meromictic (only partially intermixing) lake.

As a result, deeper layers of water remain oxygen-free.

Map: Barmsee
Map: Barmsee