Botsvatnis a lake in the municipality of Bykle in Agder county, Norway.The 14.6-kilometre (9.1 mi) long, narrow reservoir is located just to the southeast of the large lake Blåsjø and northeast of the lake Ytre Storevatnet. The lake holds water for the Brokke Hydroelectric Power Station, located in nearby Valle municipality. The water from the lake can flow out into the nearby river Otra, but only when water is released from the dam.