| Panniyar River | |
| Pushpin Map: | India |
| Pushpin Map Caption: | Location of mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | India |
| Subdivision Type2: | State |
| Subdivision Name2: | Kerala |
| Subdivision Type3: | District |
| Subdivision Name3: | Idukki District |
The Panniyar River (Malayalam: പന്നിയാർ) is a tributary of the Periyar River, which is the longest river in Idukki District of Kerala, India.[1] The tributaries of the Panniyar River are the Uchilkuthipuzha, Mathikettan Puzha, Chemmannar and Nander Puzha, which originate from the hills of Matikettan National Park.[2] Ponmudi dam is built across the river as a part of Panniyar Hydroelectric project.[3] After generating power, the water is released to Panniyar river itself. The tailwater from the Panniyar powerhouse and the spill from Ponmudi dam reach the Kallarkutty dam.[4] It then flows through Udumbanchola, Devikulam, Kothamangalam, Muvattupuzha, Kunnathunadu, Aluva, Kodungallur and Paravur. Panniyar is the source of drinking water for Rajakumari, Rajakkad, Shanthanpara and Senapati in Idukki district.[5] [6]