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 Riverhead is a town within Suffolk County, New York, on the north shore of Long Island. As of the 2010 census, the population was 33,506. The town rests on the mouth of the Peconic River, from which it derives its name. Since 1727, Riverhead has been the county seat of Suffolk County. The smaller hamlet of Riverhead lies within it, and is the town's principal economic center. The town is 166 miles (267 km) southwest of Boston via the Orient Point-New London Ferry, and is 76 miles (123 km) northeast of New York City.
Bog Brook Reservoir The Bog Brook Reservoir is a 379 acre reservoir in the Croton Watershed in southern New York State. It is located in the town of Southeast in Putnam County, and is approximately 38 mi north of New York City, to which it supplies water. It was formed by the damming of Bog Brook, a small tributary of the East Branch of the Croton River, which is in turn a tributary of the Croton River. This reservoir was put into service in 1892, making it one of the older reservoirs in New York City's water supply system.