The Connecticut River is the largest river in New England, which is a region in the eastern United States. It is about long, with a watershed covering about 11,250 square miles (29,137 square kilometers). Every second, it pours about 19,600 cubic feet (560 cubic meters) per second into its mouth at Long Island Sound, part of the Atlantic Ocean. The river flows through the U.S. states of New Hampshire, Vermont, Massachusetts, and Connecticut. Interstate 91 parallels the river for a notably long distance.