Rivers in Thiruvananthapuram

Among the three rivers in the district, the Neyyar (56 kms), the southernmost river of the State, has its origin in the Agasthyamala. Karamanayar (67 kms) and the Vamanapuram River have their origin from Chemunji Mottai of the Western Ghats.

Major back waters are Veli, Kadinamkulam, Anchuthengu and the Edava- Nadayara lakes. Besides these, there is a fresh water lake at Vellayani in Thiruvananthapuram taluk, which has the potential to become the major water sources of the district in future.