Pichavaram is a village near Chidambaram in Cuddalore District, Tamil Nadu, India. It is located between the Vellar estuary in the north and Coleroon estuary in the south. The Vellar-Coleroon estuarine complex forms the Killai backwater and the mangroves that are permanently rooted in a few feet of water. It is located at the distance of 243 km from Chennai and 15 km from Chidambaram.