| Ramanathi River | |
| Subdivision Type1: | Country |
| Subdivision Name1: | India |
| Subdivision Type2: | State |
| Subdivision Name2: | Tamil Nadu |
| Subdivision Type4: | District |
| Subdivision Name4: | Tenkasi district |
| Subdivision Type5: | Cities |
| Subdivision Name5: | Tenkasi |
| Length: | 23km (14miles) |
| Discharge1 Location: | Kizha Ambur[1] |
| Source1: | Agasthyamala Biosphere Reserve,Pothigai hills |
| Mouth Location: | Kizha ambur |
| Tributaries Left: | Thekkar |
Ramanathi (ராமாநதி) is a river flowing in the Tenkasi of the Indian state of Tamil Nadu.Gadananathi originates from Agasthyamalai Biosphere Reserve.This river enters Gadananathi River in Kizha Ambur. The Ramanadhi has 7 anicuts, a reservoir of 4300000m2, and irrigates 20.23km2 of wetlands. This river flows on many villages like Alwarkurichi, Ravanasamudram, Pottalpudur, Pillaukulam.The Gadananathi is fed by Thekkaru and Ramanathi Rivers.This was proposed and opened by Karunanithi.
Ramanathi reservoir is located at the foot of the Western ghats in Kadayam village of Kadayam Taluk in Tenkasi District. It is one of tourist place in this district. Now a lot of tourists are visiting the dam and park.