Great South Bay, Protected lagoon in Long Island, New York, US
Great South Bay is a shallow, protected lagoon sitting between Long Island and Fire Island with waters averaging 4 feet deep. The bay connects to the Atlantic Ocean through Fire Island Inlet, creating an open system where ocean and bay waters mix.
The region was originally home to the Montaukett Indian Nation before European settlers arrived in the 17th century. Families like Smith, Carman, and Hewlett later established themselves in the area and shaped its growth.
Shellfishing traditions, especially oyster and clam harvesting, remain central to how people connect with the bay today. Fishing communities along the shores have shaped their identity around this working relationship with the water.
Access to the bay is available from multiple points along Long Island, from towns like Bellport to the barrier beaches. The best time to visit is from late spring through early fall when the weather is mild and water conditions support boating and fishing activities.
Hurricane Sandy in 2012 tore new breaches through the barrier islands, creating Old Inlet near Bellport. This unintended change actually improved water quality by allowing more ocean water to flow in, which reduced nitrogen levels significantly.
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