Outer Barrier

The Fire Island Inlet Bridge, an integral part of the Robert Moses Causeway, is a two-lane, steel tied arch span with a concrete deck that carries the parkway over Fire Island Inlet. Construction of the Fire Island Bridge was completed in 1964 and although a relatively young structure, (less than 60 years old), its concrete deck has suffered from severe chloride ingress resulting in cracks, spalling, and the formation of potholes.The Fire Island Inlet span of the Robert Moses Causeway connects to Robert Moses State Park on the western tip of Fire Island. The Fire Island Inlet Bridge is located south of the State Boat Channel Bridge, a 665-foot (203 m) long bascule bridge modeled after Brooklyn's Mill Basin Drawbridge.

Captree is a census-designated place (CDP) in the towns of Islip and Babylon in Suffolk County, New York, United States. It occupies Captree Island in Great South Bay, as well as the east end of Jones Beach Island to the south, comprising Captree State Park. It was first listed as a CDP prior to the 2020 census. Prior to that it was part of the Oak Beach–Captree CDP. The community is in southwestern Suffolk County, on two islands that lie between Long Island to the north and Fire Island to the south. The eastern two-thirds of the CDP are in the town of Islip, while the one-third of the CDP that occupies the portion of Captree Island west of the Robert Moses Causeway is in the town of Babylon. The Robert Moses Causeway connects Captree and Jones Beach islands with West Islip, 6 miles (10 km) to the north on Long Island. Ocean Parkway runs west from Captree through Oak Beach and Gilgo, leading 14 miles (23 km) to Jones Beach State Park. To the south, the Fire Island Inlet Bridge leads 1 mile (1.6 km) to Robert Moses State Park on Fire Island.

Robert Moses State Park - Long Island is a 875-acre (3.54 km2) state park in southern Suffolk County, New York. The park lies on the western end of Fire Island, one of the central barrier islands off the southern coast of Long Island, and is known for its five-mile (8.0 km) stretch of beaches on the Atlantic Ocean. The park is accessible from Long Island by the Robert Moses Causeway across Great South Bay. Established as Fire Island State Park in 1908, the park is the oldest state park on Long Island. Its current name was given to honor Robert Moses, the influential mid-20th century urban planner and former president of the Long Island State Park Commission. Recently, lawmakers have suggested the park should revert to its previous name or to something that better reflects its location.

Captree State Park is a 340-acre (1.4 km2) state park located in the towns of Babylon and Islip in Suffolk County, New York, United States. The park is located south of Captree Island on the easternmost end of Jones Beach Island, and overlooks the Fire Island Inlet and the westernmost section of Fire Island.Captree State Park can be accessed via the Robert Moses Causeway and the Ocean Parkway. The park primarily provides boating and fishing access to the Atlantic Ocean and Long Island's Great South Bay, and numerous charter boats are available for fishing excursions.

The State Boat Channel Bridge is a bascule bridge (drawbridge) in Suffolk County, New York, United States. It crosses over the Long Island New York State Boat Channel connecting Captree Island and Jones Beach Island on Robert Moses Causeway in the Oak Beach–Captree area within the town of Babylon. The 665-foot-long (203 m) bascule bridge meets the Ocean Parkway at a cloverleaf interchange. This interchange, which provides access to Captree State Park, Gilgo State Park and Jones Beach State Park, served as the southern terminus of the Robert Moses Causeway that leads to the Fire Island Inlet Bridge, the Fire Island Lighthouse, and Robert Moses State Park.

Gilgo-Oak Beach-Captree, frequently just called Oak Beach, was a census-designated place (CDP) in Suffolk County, New York within the Town of Babylon. The population was 333 at the 2000 census. Following the 2010 census, the area was delineated as two CDPs: Gilgo and Oak Beach–Captree. The original CDP contained several small beach communities on a barrier island along the southern edge of Long Island. In order from west to east, these included West Gilgo Beach (on the Nassau/Suffolk county border), Gilgo Beach, Cedar Beach (no residences), Oak Beach (including the Oak Island Beach Association), Oak Island and Captree Island. They are connected to the mainland by Ocean Parkway from the west and Robert Moses State Parkway from the north. Prior to the 2020 census, the Oak Beach-Captree CDP was further split into the Oak Beach and Captree CDPs.

The Oak Beach Inn, commonly referred to by the abbreviation OBI, was a Long Island nightclub located in Oak Beach, on Jones Beach Island near Captree State Park in the Town of Babylon, Suffolk County, New York.

Oak Beach is a small community and census-designated place located near the eastern end of Jones Beach Island, a barrier island between the Atlantic Ocean and the Great South Bay of Long Island. The community is part of the village of Babylon in Suffolk County, New York, United States. The eastern part, the Oak Island Beach Association, is gated, whereas the western part is not. The Oak Beach CDP was first listed prior to the 2020 census. Prior to that the community was part of the Oak Beach–Captree census-designated place.

Oak Beach–Captree, frequently just called Oak Beach, was a census-designated place (CDP) in the town of Babylon in Suffolk County, New York, United States. The population was 286 at the 2010 census.Prior to the 2010 census, the area was part of a larger CDP called Gilgo-Oak Beach-Captree, New York. The Oak Beach–Captree CDP consists of some small beach communities on a barrier island along the southern edge of Long Island, including Oak Beach, Oak Island, and Captree Island. As of 2020, Oak Beach–Captree was split into two separate CDPs called Oak Beach and Captree.

The Fire Island Lighthouse is a visible landmark on the Great South Bay, in southern Suffolk County, New York on the western end of Fire Island, a barrier island off the southern coast of Long Island. The lighthouse is located within Fire Island National Seashore and just to the east of Robert Moses State Park. It is part of the Fire Island Light Station which contains the light, keepers quarters, the lens building containing the original first-order Fresnel lens, and a boat house.

Fire Island Inlet is an inlet on the south shore of Long Island, New York. It connects the Great South Bay with the Atlantic Ocean, passing between Robert Moses State Park (the western end of Fire Island) on the south and Oak Beach and Captree State Park (the eastern end of Jones Beach Island) on the north. The inlet is directly south of West Islip, the nearest town on the main part of Long Island. Fire Island Inlet has evolved over the years due to natural processes, especially longshore drift. Jones Island and Fire Island at one time were connected.The Fire Island Light was at the mouth of the inlet when built in 1825, but is now five miles (8.0 km) east of the inlet.The northwest side of the mouth of the inlet is known as the Sore Thumb, and is a man-made barrier that was created to try to combat the extensive erosion of the beaches inside the inlet. The southeast side of the mouth of the inlet is known as Democrat Point and is known as a popular surfing spot for beach goers, as well as a popular 4x4 fishing area. It is also the site of extensive preserves for the area's birds.