The Mohawk, Hudson, NIAGARA, EAST, Tioga, and Oswego Rivers are all part of the New York River system. The Mohawk River is the longest river in the state, flowing for over 150 miles from the Adirondack Mountains to the Hudson River. The Hudson River is a 315-mile long river that flows from the Adirondack Mountains to the Atlantic Ocean. The NIAGARA River is a 35-mile long river that connects Lake Erie to Lake Ontario. The EAST River is an estuary that separates Manhattan from Long Island. The Tioga River is a tributary of the Susquehanna River that flows through the Finger Lakes region. The Oswego River is a tributary of Lake Ontario that flows through central New York.