Vettar is a river flowing in Tiruvarur district, Thanjavur district and Nagapattinam district of the Indian state of Tamil Nadu.
Vettar River is a tributary of the river Kaveri. This river reaches the sea near the Karaikal port in Nagore.
List of rivers of Tamil Nadu
Coordinates: 10°50′N 79°51′E / 10.833°N 79.850°E / 10.833; 79.850