Cross Bay Swim

Halfway across the Great South Bay, the water beneath you shifts in character as the tidal flushing from the Fire Island Inlet takes hold. This current was once a source of stagnation for decades, but since the 2012 breach at Old Inlet, the bay breathes more freely, circulating salt and oxygen that change the feel of your stroke. In these shallow, sandy stretches, you might catch a glimpse of horseshoe crabs, ancient arthropods that have navigated these bottoms since the end of the Ice Age, often lingering just below the surface in the bright, shifting light.

A historic passage

The Cross Bay Swim, a 5.5-mile crossing that dates back to 1927, demands more than just endurance. As you sight toward the shore, you are tracking a route that mirrors the historic coastal landscape of Long Island. The northern terminus at Gilbert Park sits near Sagtikos Manor, a site that functioned as the local command post for British forces under General Sir Henry Clinton during the American Revolution and hosted George Washington in 1790. While the course itself is rooted in long-standing tradition, the atmosphere is tempered by the quiet intensity of the marshlands nearby. The Seatuck National Wildlife Refuge edges the bay, creating a backdrop where you might spot red fox or deer near the reeds. Swimmers looking for a different challenge in the region often consider the Nassau/Suffolk Long Island Open Water Swim.

Local lore and logistics

Local legend suggests the Fire Island Lighthouse—your starting point—is haunted by a keeper and his daughter, a grim tale born from the isolation of the tower. This folklore is a staple of the shoreline, much like the modern-day internet myth of eight-foot-long horseshoe crabs that briefly captured the local imagination. Because the channel is subject to specific tidal windows and navigational constraints, the race requires strict organization and support. The event, which maintains a limited number of entries, is a communal effort involving dedicated support kayakers who navigate the bay alongside every participant to ensure safety across the distance.