The Delaware River is 410 miles long and serves as the boundary between Pennsylvania and New York, New Jersey and Pennsylvania, and New Jersey and Delaware. Over seventeen creeks and streams flow into the Delaware River, and there are over fifty bridge crossings at various locations along the river.
The Delaware River flows south into the Delaware Bay, an inlet of the Atlantic Ocean. The bay is bordered by New Jersey on the north and Delaware by the south. The Salem, Maurice, St. Jones, Christina and Leipsic rivers all flow into Delaware Bay. The upper portion of the bay is connected to the Chesapeake Bay by the Chesapeake and Delaware Canal.
The bay shores are primarily composed of salt marshes and mud flats, and the bay is known as an oyster supplier, and a breeding ground for horseshoe crabs.