Great South Bay, NY

Great South Bay begins with a narrow channel through the shoals off Amityville on the mainland and widens out to provide much of the shore’s deepest water and prime sailing grounds. Mid-bay depths run from 7 to 10 feet MLW with some holes even deeper but with shallower spots as well. The Great South Bay is 25 nm long and 5 nm at its widest point near the western end, the largest of the Long Island South Shore bays.
Marinas, Dockage, Service & Navigation
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Boating Destinations near the Great South Bay, NY
The Matinecocks (one of the 13 Native American tribes of Long Island) were the original inhabitants of the Northport area, which was the called Opcathontyche, meaning "wading place creek." In 1656, Chief Asharoken, head of the tribe, sold the area to three Englishmen who grazed cattle on pastures around the harbor. The harbor became known as Cow Harbor. In 1932, the village of Northport purchased the land along the harbor and created Northport Memorial Park, which remains a strong feature of Northport today.

The Waterway Guide Team has gained extensive boating knowledge over the years, and now we are sharing all of the tips, skills and tools we’ve picked up along the way!