Bolgodq Ganga

Bolgoda, presumed to be the largest natural lake in Sri Lanka, covers almost two thirds of the Kalutara district, extending from Anguruwatota to Piliyandala. It is also the largest fresh water lake in Sri Lanka. The lake's depth is said to range from 20-50 feet.
The Bolgoda lake system is situated in the low country wet zone of Sri Lanka between longitudes E . 79 . 55'-79 . 58'and latitudes N . 6 . 40' – 6 . 48'. This system is made up of two interconnected lakes and their waterways. The North Lake, parts of which belong to both Colombo and Kalutara districts, is the larger. It is fed by Weras Ganga and Bolgoda Ganga which bring water from the South Lake. It discharges to the sea through the Panadura estuary. The South Lake is situated in Kalutara district and is fed by Panape Ela. It is connected to the sea via Thalpitiya Ela . The Bolgoda Ganga , the channel which connects these two water bodies, is joined by Rambana Ela , which drains the water of Maha Oya in to the lake system. This lake system drains a substantial area (about 374 Km 2 ) wedged between the western part of the Kalu and Kelani river basins.