underwater sources on the reservoir lake klöntalersee kloentalersee or klontaler lake and in the klöntal alpine valley

alpine background beautiful beauty blue canton clear concept conservation depth design detection earth ecology education emitting energy environment glarus grande green kloental kloentalersee klontal klontaler klöntal klöntalersee lake landscape life liquid mysterious natural nature navigation outdoor park power reflect reflection renewable reservoir river rock safety schweiz science scuba sea sonar soundwave source sources summer surface swimming switzerland tourism travel underground underwater valley vibration view water wave