O'Sullivan Beach

O'Sullivan Beach is a sandy coastal beach and suburb in the City of Onkaparinga, about 30 kilometres south of Adelaide, South Australia, on the eastern shore of Gulf St Vincent. It is known for its long sandy shoreline, prominent boat ramp and breakwater, and views across the gulf. The beach is popular for swimming, fishing, boating and coastal walks, and forms part of the continuous metropolitan coastline between Christies Beach and Lonsdale.

Visitors can expect a long, sandy beach on Gulf St Vincent with a large boat ramp and rock breakwater at the southern end. The foreshore includes open sand, grassed reserve areas, and coastal paths with views across the gulf. The area is used for swimming, fishing from the beach and breakwater, launching boats, walking and photography. Facilities are concentrated near the boat ramp and foreshore reserve, with residential areas directly behind the beach.