This catchment lake, also calles Lake Iselsee, lay on 1'606 m asl, a bit below the village of Arosa.
The catchment lake is situated below the village of Arosa and exists already since 1897. The 12 m high wall keeps the water back. For security reasons, it is not allowed to swim on/in the lake, despite its idyllic views. Fishing is allowed only from its banks and with an according allowance.