The county seat of Suffolk County, NY lies at the mouth of a river that flows into which body of water?
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 drains an area between the Harbor Hill and Ronkonkoma terminal moraines, and flows into Flanders Bay which in turn connects to Peconic Bay east of Riverhead.
i don't know