Perunchani Dam is an irrigation dam at Perunchani, about 42 km from Nagercoil, the administrative headquarters-town of Kanyakumari District, and about 10 km from the town of Kulasekhram.
The dam is built across the River Paralayar. It is a straight gravity masonry dam of 373.10 meters long consisting of 275.28 meters of bulk head section. A drainage gallery of 1.52 x 2.29 M has been provided in the middle river section for a length of 45.70 M which serves a longitudinal inspection chamber as well as out-let for the seepages from the foundation.
The dam is set amidst the hills of the Western Ghats and commands a picturesque view of the hills and lush greenery around.