| Total Vellar basin Area 7466.947 sq.km |
| 1 |
Upper Vellar |
1827.874 sq.km |
Singipuram Ar, Anaimaduvu Ar, Kallar, Ellar Ar |
Salem |
Anaimaduvu Kariyakovil |
49 |
| 2 |
Swethanadhi |
1031.097 sq.km |
Swethanadhi, Kallar |
Perambalur Salem |
– |
27 |
| 3 |
Chinnar |
639.623 sq.km |
Koneri Ar, Elumur Ar, Chinnar |
Perambalur |
– |
27 |
| 4 |
Anaivari Odai |
370.165 sq.km |
Anaivari Odai |
Ariyalur |
– |
16 |
| 5 |
Gomukhi |
1157.364 sq.km |
Gomukhinadhi, Thirumanimukdhanadhi, Mayuranadhi |
Cuddalore Villupuram |
Gomukhi |
86 |
| 6 |
Manimukdhanadhi |
724 sq.km |
Manimukdhanadhi |
Villupuram |
Manimukdha |
57 |
| 7 |
Lower Vellar |
1715.927 sq.km |
Vellar, Manimukdhanadhi Peria Odai, Pillur Odai |
Cuddalore Villupuram |
Wellington |
132 |
