COLEROON RIVER, the northern branch of the Cavery, from which it diverges below the island of Seringham, near Trichinopoly, in Southern India, and falls into the sea at Devicotta, in Lat. 11. 22., Long. 79. 52., after a course of about 92 miles. The entrance of the river is difficult and dangerous of access from a bank called Coleroon Shoal, which stretches 4 or 5 miles to the S.E. An extensive system of canal irrigation, in connection with the waters of this river, has been established by the local government.