Riverhead is a town that rests on the mouth of the Peconic River that is a river within Suffolk County in what state?
Riverhead (town), New York: Riverhead is a town within Suffolk County, New York, on the north shore of Long Island. Riverhead (town), New York:  The town rests on the mouth of the Peconic River, from which it derives its name. Peconic River: The Peconic River is a river within Suffolk County on Long Island, New York in the United States.
New York