Lake Sapanca (Turkish: Sapanca Gölü) is a fresh water lake in Turkey, between the Gulf of İzmit and the Adapazarı Meadow. The lake has a catchment area of 251 km², surface area is 45 km², a length 16 km east-west / 5 km north-south, and a maximum depth of 52 m. Lake Sapanca, Turkey Sapanca Lake is located on a tectonic hole, which is situated between Izmit Bay and Adapazari Meadow and runs parallel to Iznik Lake.
The catchment area of Lake Sapanca – about 251 km2 [km²] – is surrounded by mountains in the south and small hills in the north. Water is taken from the Lake for domestic and industrial needs. The region around Sapanca has become very important for day trips and weekend vacations with its charming natural beauty.