Adyar River is one of the two rivers that flows in Chennai. It originates near the Chembarambakkam Lake, Kanchipuram district.The long river contributes to the estuarine ecosystem of Chennai. Despite the high pollution levels, boating and fishing take place in this river. The river collects surplus water from about 200 tanks and lakes, small streams and the rainwater drains in the city, with a combined catchment area of . Most of the waste from the city is drained into this river and the Cooum River.