Geographic features: The Chemung River is formed by the confluence of the Tioga River, flowing northward from Pennsylvania, and the Cohocton River, flowing southeast in New York. The Chemung joins the Susquehanna River at Sayre, Pennsylvania.
The terrain is typical of glaciated watersheds, and is comprised of rolling to flat-topped uplands with steep-sided alluvial valleys in which the main rivers flow. Forest occupy the steeper hillsides bordering stream valleys, while the flatter hilltops and stream valleys are used for agriculture.
Total - 2,595 square miles
In NY - 1,742 square miles
In PA - 853 square miles
Major tributaries: Chemung, Tioga, Cohocton, Cowanesque, Canisteo
Total - 223,450* (5.4% of the total basin population)
In NY - 180,750
In PA - 42,700
*Population estimated from 2010 Census
Major population centers: Elmira, Corning, Hornell (all in New York)