Meet the site
Moolap Reef, also recorded as the Outer Harbour Shellfish Reef, is not a dive site in the usual sense but a restoration project that happens to be diveable. Port Phillip once had vast beds of native flat oysters and blue mussels that were dredged out by the early twentieth century, and since 2015 the Victorian Fisheries Authority, The Nature Conservancy and the Albert Park Yachting and Angling Club have been rebuilding shellfish reefs at several sites in the bay, including here in the outer harbour of Corio Bay between Point Henry and Point Richards. The method is to lay a base of limestone rubble and recycled shell on the mud and seed it with hatchery-reared oysters and mussels, and the result is a low, broad mound in about 10 m of water that is steadily being colonised. The name Moolap is from the Wadawurrung language and is said to mean a place of men fishing with spears. For a diver the reef is a flat, easy 10 m dive with a purpose: to see how quickly shell structure on bare mud attracts life. Within a few seasons the rubble is grown with ascidians, sponges, hydroids and algae, native oysters are visible among the shell, and the mound holds snapper, leatherjackets, wrasse, gobies, blennies and cuttlefish, with flathead, rays and the introduced Northern Pacific seastar on the mud around it. It is used mainly by research and monitoring divers and occasionally by Geelong clubs, is unmarked on the surface, and is fished, so a flag and care with line are needed. The nine Wilson Spit shellfish reefs lie 3 km east and can be dived on the same outing.
What you might see
Native flat oysters and blue mussels, ascidians, sponges, hydroids, snapper, leatherjackets, wrasse, gobies, blennies, cuttlefish, flathead, rays, Northern Pacific seastar (introduced)
Location
Restored shellfish (mussel and oyster) reef on the floor of Corio Bay's outer harbour, roughly midway between Point Henry and Point Richards, in about 10 m.
Facilities nearby
Limeburners Point (Geelong), Point Richards (Portarlington), Avalon Beach and Geelong Grammar lagoon boat ramps
Before you make plans
Conditions, access and operator schedules can change. This is a location guide, not a dive plan. Ask a local operator about current conditions and suitability for your training and experience.
Sources & further reading
scubadoctor.com.auscubadoctor.com.auRecord updated 26 Sept 2026. Source claims are being reviewed.