The lake's turquoise color is caused by the presence of calcium carbonate, which reflects light in a specific spectrum.
Caumasee is part of the Flimserwald, a forest covering the massive debris field from the prehistoric Flims Rockslide.
The name 'Cauma' derives from the Romansh word 'caum', meaning 'resting place' or 'siesta'.
The water is fed entirely by subterranean sources, meaning there are no surface streams flowing into the lake.
The small island in the center of the lake is a popular destination for swimmers, reachable by foot or boat.
Despite its high mountain location, the lake remains relatively warm compared to other Swiss Alpine lakes.
Caumasee is a naturally occurring lake in Flims, Switzerland, renowned for its vivid turquoise water resulting from high mineral content and groundwater influx. The lake is situated at an elevation of 997 meters within the Flimserwald forest. It maintains a constant water supply from underground springs, causing the water level to fluctuate seasonally. The site features a small, central island and is surrounded by dense pine and spruce woodland. It is geographically located in a landslide basin created by the Flims Rockslide thousands of years ago. The lake's surface temperature is relatively high for an Alpine body of water due to its sheltered location and lack of major inflow rivers. Swimming, paddleboarding, and rowing are permitted activities during the summer season.
The observation platform located near the funicular exit, providing a panoramic view of the turquoise water and the central island.
Bring a towel and swimwear, as the main appeal is the water access.
Pack a picnic, as on-site dining options can be crowded during peak hours.
Use the funicular railway nearby to avoid the steep hike back up to Flims village.
Avoid arriving mid-afternoon on weekends during July and August, as the limited beach area reaches capacity quickly.
Access is restricted during the winter months; the facility operates primarily from late spring to early autumn.
Respect quiet zones around the shoreline; do not leave litter in the forest area.
