The Delaware River is a major river on the Atlantic coast of the United States. It drains an area of 13,539 square miles (35,070 km2) in four U.S. states: Delaware, New Jersey, New York and Pennsylvania. Rising in two branches in New York state's Catskill Mountains, the river flows 419 miles (674 km) into Delaware Bay where its waters enter the Atlantic Ocean near Cape May in New Jersey and Cape Henlopen in Delaware.