Mount Sinai is located in the Town of Brookhaven. It is the only town in Suffolk County, New York that stretches from the north to the south shore, with access points to both the Long Island Sound and the Great South Bay. Nine villages and fifty unincorporated hamlets make up the Long Island Town of Brookhaven. The northern part of Mount Sinai Harbor borders an active recreation area that is located on a 2-mile long peninsula. This includes Cedar Beach, one of the most popular North Shore beaches during the summer months. A marine sanctuary and nature preserve connects the various sections of Cedar Beach with scenic walking trails and serves to protect the remaining sand dunes. Commonly owned lands set aside in 1664 are being used for public recreation. A number of commercial fishermen work out of the harbor and fish in Long Island Sound. The southern part of it is a more serene location. Clamming is a popular activity during low tide, as is fishing at high tide. Throughout its history, Mount Sinai Harbor has been utilized for the catching of shellfish, the fishing of snapper and flounder, the hunting of waterfowl, sand milling, and the harvesting of salt hay. Satterly Landing, a small park that once housed a boathouse, provides views across the harbor. The original mouth of the harbor was on the east side. Winds and tides continually narrowed its opening. Local residents toiled at widening the mouth. In the mid 19th century a new mouth was dredged on the west side of the harbor. Tides continue to dump sand, narrowing the mouth of the harbor. It still must be dredged to keep it open to allow for the boats moored in the harbor to reach the Sound.