Garichtisee, Reservoir on the Mettmenalp above Schwanden, Canton of Glarus, Switzerland

Garichtisee, also called Mettmensee locally, is a small mountain reservoir in the Glarus region situated at about 1,622 meters (5,321 feet) elevation. A dam controls the water flow downstream into the Niederenbach stream, and the lake stretches roughly 500 meters (1,640 feet) long and 200 meters (656 feet) wide.

Garichtisee was built between 1929 and 1931 as a reservoir for hydropower. Water is carried through a pressure tunnel about 3,900 m long and a penstock down to the Sernf-Niederenbach power plant of SN Energie AG in Schwanden at 534 m, which produces roughly 130 million kWh a year. Two dams impound the lake: the main dam on the northwest shore is 42 m high with a 229.3 m crest, the smaller northeast dam 18.25 m high and 254.2 m long.

The lake is also called Mettmensee, after the Mettmenalp where it lies. Its water is used for hydropower: it drops through a 3,900 m pressure tunnel to the Sernf-Niederenbach power plant in Schwanden at 534 m, which produces around 130 million kWh a year. The lake sits in the Freiberg Kärpf, Europe's oldest wildlife sanctuary.

The lake is reached by a small aerial cable car from the hamlet of Kies in the Niederental valley, which climbs to about 1,600 m. A footpath circles the water in roughly 45 minutes. From the shore, trails continue to the Leglerhütte, over the Wildmadfurggeli toward Ämpächli above Elm, or to the Berglimattsee and on to Matt.

The lake lies within Freiberg Kärpf, described in the sources as Europe's oldest wildlife sanctuary. The reservoir was built between 1929 and 1931 and its water drops through a roughly 3,900 m pressure tunnel to the Sernf-Niederenbach power plant at 534 m, which produces about 130 million kWh a year.