Coleroon River, a major waterway of the
s, is formed by the bifurcation of the
at Srirangam. This northern branch of the Cauvery flows through the Chidambaram taluk for 36 miles and finally joins the Bay of Bengal
6 miles south of Porto-Novo (Parangipettai).
The famous Sri Ranganathasamy temple is situated near the Coleroon.