Lake Sapanca is a fresh water lake in Turkey, between the Gulf of İzmit and the Adapazar Meadow. 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 sq. km [km²] – is surrounded by mountains in the south and small hills in the north.The region around Sapanca has become very important for day trips and weekend vacations with its charming natural beauty