Vallülasee  Lake Vallüla (German "Vallülasee") is a mountain lake located in Montafon, Austria. This secluded area on "Mount Vallüla" can only be reached on foot due to its high elevation and rough terrain. The climb takes approximately 5 hours. The mountain lake possesses clear, chilly drinking water. The "Vallülabach" (length: ~ 5 km) feeds and drains the lake and merges with the river Ill. Fishes such as trout can be found in the water.