The county seat of Suffolk County, NY lies at the mouth of a river that flows into which body of water?
Peconic River The Peconic River is a river within Suffolk County on Long Island, New York in the United States. The river is located in the eastern end of Long Island. 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.
Tioughnioga River The Tioughnioga River is a 34.2 mi tributary of the Chenango River in central New York in the United States. It drains a dissected plateau area east of the Finger Lakes at the northernmost edge of the watershed of the Susquehanna River.