Kumbukkan Oya (කුඹුක්කන් ඔය)
The Kumbukkan Oya is the twelfth-longest river of Sri Lanka. It is approximately 116 km (72 mi) long. It runs across two provinces and two districts. Its catchment area receives approximately 2,115 million cubic metres of rain per year, and approximately 12 percent of the water reaches the sea. It has a catchment area of 1,218 square kilometres.