Rivers of Tamil Nadu
River questions come in pairs: origin-and-river matching, and river-and-dam matching. This list carries both columns.
| River | Origin | Notable fact |
|---|---|---|
| Cauvery | Talakaveri, Coorg (Karnataka) | TN's lifeline; delta at Poompuhar; Mettur dam |
| Kollidam | Distributary of Cauvery at Upper Anaicut | Northern arm of the Cauvery delta |
| Palar | Nandi Hills (Karnataka) | Flows through Vellore belt; largely seasonal |
| Thenpennai (Pennaiyar) | Nandi Hills (Karnataka) | Sathanur and Krishnagiri dams |
| Vaigai | Varusanadu Hills (Western Ghats) | Madurai's river; Vaigai dam in Theni |
| Thamirabarani | Agasthyamalai (Pothigai hills) | Only perennial river originating within TN; Papanasam dam |
| Bhavani | Nilgiris (Western Ghats) | Major Cauvery tributary; Bhavanisagar dam |
| Amaravathi | Anamalai hills | Cauvery tributary; Amaravathi dam |
| Noyyal | Vellingiri hills | Flows past Coimbatore and Tiruppur |
| Vellar | Kalrayan/Shervaroy hills | Central TN river to the Bay of Bengal |
| Cheyyar | Javadhu hills | Palar tributary |
| Vaippar | Western Ghats (Virudhunagar belt) | Southern seasonal river |
| Gundar | Varusanadu hills | Southern seasonal river |
Watch the shared-origin trap: the Palar and the Thenpennai both rise at Nandi Hills in Karnataka, while the Thamirabarani remains the only perennial river rising within Tamil Nadu.
Frequently asked questions
Which is the only perennial river originating inside Tamil Nadu?
Where does the Cauvery enter the sea?
Related lists
Dams in Tamil Nadu
The dam-river matching list TNPSC asks: Mettur on Cauvery, Vaigai, Bhavanisagar, Sathanur, Papanasam, Amaravathi, Mullaperiyar and more.
Districts of Tamil Nadu
All 38 districts of Tamil Nadu in one list, with the newest districts and their carve-outs, the way TNPSC asks them.
Chief Ministers of Tamil Nadu
Every Chief Minister of Madras State and Tamil Nadu since 1946, with tenures, the exact list TNPSC draws sequence questions from.
National Parks of Tamil Nadu
Tamil Nadu's 5 national parks: Guindy, Gulf of Mannar Marine, Indira Gandhi (Anamalai), Mudumalai and Mukurthi, with the distinguishing fact TNPSC asks about each.
Compiled from official Tamil Nadu government sources and standard references. Time-sensitive counts carry an as-of note on the page. Sources: TNPSC official notifications. Figures are indicative and may change with each official notification. Data last reviewed: July 2026.
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