The Kala Oya is the third longest river in Sri Lanka.

The 145 km (90 mi) long river has a basin size of 2,873 km2 (1,109 sq mi),[1] and more than 400,000 rural population live by the river basin.

[2] Its catchment area receives approximately 3,169 million cubic metres of rain per year, and approximately 5 percent of the water reaches the sea.

It has a catchment area of 1,792 square kilometers.

This article related to a river in Sri Lanka is a stub.