The major river in the district is [[Thamirabarani River|Thamirabarani]] locally known as Kuzhithurai Aaru (Kuzhithurai River). This river has two major tributaries, Kodhayaru and Paraliyaru, with the [[Pechiparai Dam]] and [[Perunchani Dam]], respectively, built across them. There are many tributaries for the Kodayar River of which [[Chittar River|Chittar]] I and Chittar II, with their dams, are the major ones. The origin of Tambaraparani River is in the [[Western Ghats]] and the river confluences with [[Laccadive Sea]] near Thengapattanam, about west of Kanyakumari town.