The Maha Oya (Sinhala: මහ ඔය, lit.

'Great River') is a major watercourse in the Sabaragamuwa Province of Sri Lanka.

It measures approximately 134 km (83 mi) in length.

[2] Its catchment area receives approximately 3,644 million cubic metres of rain per year, and approximately 34 percent of the water reaches the sea.

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