Lighthouse Reef – South West Rocks

Lighthouse Reef, South West Rocks

By ScubaDownUnder Team · 2026-05-14

Three kilometres off Smoky Cape on the South West Rocks coastline, in 15 to 22 metres of water below the white tower of one of NSW's oldest working lighthouses, a granite reef extends along the seafloor and holds a population of grey nurse sharks year-round. Lighthouse Reef is the second-tank dive on the standard South West Rocks day, run after [Fish Rock Cave](https://www.scubadownunder.com/dive-sites/fish-rock-cave) or as the alternative when Fish Rock conditions don't allow the cave swim. The reef is shallower, more sheltered and easier to navigate than Fish Rock, and many divers leave the trip rating Lighthouse Reef as the more relaxed and photogenic of the two sites.

Smoky Cape Lighthouse, completed in 1891 and operated by the NSW maritime authorities since, sits on the southern headland of South West Rocks within the broader Hat Head National Park. The reef below the cape takes its working name from the lighthouse and was identified as a productive dive site in parallel with Fish Rock through the 1970s. The waters off Smoky Cape and Fish Rock are designated Critical Habitat under the NSW Fisheries Management Act for the critically endangered grey nurse shark, recognising both sites as among the most reliable east coast aggregations. The Dunghutti and Gumbaynggirr peoples are the traditional custodians of the Macleay catchment country.

Lighthouse Reef runs along a granite ridge in 8 to 22 metres of water, with the shallowest sections on the inshore side rising to within 5 metres of the surface and the deeper terraces stepping down to 22 metres on the seaward face. The terrain is granite boulders interspersed with sand gutters and a series of small overhangs that grey nurse sharks use as resting habitat. Operators usually drop divers on a fixed line at the deeper end of the reef and dive shallows toward the upper terrace, finishing the safety stop in the calmer water at the top. The first wobbegong is usually visible inside the first minute, draped on a boulder edge or sleeping in a sand patch. Schools of yellowtail and big-eye trevally orbit the central reef structure, and the grey nurses, when present, hold in the gutters in mid-water in the same posture they show at Fish Rock.

The grey nurse sharks are the headline at Lighthouse Reef and are present year-round in numbers that vary with season. Aggregations build through autumn into winter, and counts of fifteen to twenty-five animals can occur from April through September on the better days. The sharks here behave as they do across their NSW range: placid, slow, indifferent to divers who hold position. Wobbegongs, banded and tasselled, are resident in the reef gutters and along the boulder edges, with the largest individuals over a metre and a half. Eagle rays and bull rays cruise the sand on the seaward face. Black cod, critically endangered on the east coast, are resident in the deeper rock holes, and large eastern blue gropers patrol the shallower terraces. Green and loggerhead turtles work the upper reef. Pelagics including kingfish, longtail tuna and Spanish mackerel pass through on summer tide changes. Macro divers find anglerfish on the sponge ledges, nudibranchs through the cooler months, and the occasional pygmy pipehorse on the deeper gorgonian fans.

Visibility at Lighthouse Reef typically runs 10 to 25 metres, with the cleanest days falling in autumn when the East Australian Current is established and the Macleay catchment is dry. Heavy rain on the catchment can drop visibility for several days, and the reef's relative proximity to shore makes it more susceptible to coastal water than Fish Rock further offshore. Water temperature ranges from around 18°C in August to 26°C in February. A 5mm wetsuit handles the cooler months; a 3mm shortie is enough through summer. Currents at the reef are generally lighter than at Fish Rock, with the seaward face catching the more substantial flow on running tides. Surface swell affects the dive less than at Fish Rock since the reef sits closer to shore in the lee of the cape, but anything over 2 metres typically closes the site. April to September is the peak grey nurse season and the working dive season for visiting divers chasing the aggregation. Summer offers warmer water, longer days and stronger pelagic action.

Repeat divers know Lighthouse Reef as the slower, more careful counterpart to Fish Rock. The reef is small enough to know after two or three dives, and the same animals can be relocated on consecutive trips. The deeper ledges on the seaward face hold the larger wobbegongs and the older grey nurses, while the shallower northern terraces produce more variety: smaller resident species, photogenic kelp, and the occasional whale shark or manta on a long summer tide. Photographers find the reef's layout suits wide-angle work along the gutters and macro work on the sponge edges. Night dives are not commonly run but reveal feeding wobbegongs, basket stars and bobtail squid on the sand around the perimeter.

Lighthouse Reef sits in the shadow of Fish Rock, and on the right afternoon, literally so. It is the reef that gets dived when Fish Rock cannot be, and the reef that produces a different but no less rewarding day with the same critically endangered animals. For divers planning a South West Rocks trip, Fish Rock is the reason for the journey and Lighthouse Reef is the reason the trip extends to a second day.

## Site Access and Logistics

Lighthouse Reef is a boat dive only. The standard departure point is South West Rocks, with a transit of around 10 to 15 minutes from the Trial Bay boat ramp to the reef. Both established South West Rocks operators run the site, often as the second tank of a two-tank day with Fish Rock Cave as the first dive.

Entry is a backward roll or giant stride from the dive boat onto a fixed mooring or reference line at the deeper end of the reef. Exit is a controlled ascent on the line and re-board over the boat tubes, with safety stops conducted in the calmer shallow water near the top of the reef.

Minimum certification is PADI Open Water for the shallower terraces, with Advanced Open Water recommended for the deeper end of the reef. Twenty logged dives is a sensible working minimum, particularly for divers planning to work the deeper sections.

Bookings and trips run through [South West Rocks Dive Centre](https://www.southwestrocksdive.com.au) and [Fish Rock Dive Centre](https://www.fishrock.com.au).

## Sources

- South West Rocks Dive Centre, Lighthouse Reef briefings: [https://www.southwestrocksdive.com.au](https://www.southwestrocksdive.com.au) - Fish Rock Dive Centre, operator site notes: [https://www.fishrock.com.au](https://www.fishrock.com.au) - NSW Department of Primary Industries, Critical Habitat Declaration for grey nurse shark: [https://www.dpi.nsw.gov.au/fishing/threatened-species](https://www.dpi.nsw.gov.au/fishing/threatened-species) - Heritage NSW, Smoky Cape Lighthouse listing - Michael McFadyen's Scuba Diving, South West Rocks references: [http://www.michaelmcfadyenscuba.info](http://www.michaelmcfadyenscuba.info) - Australian Museum, grey nurse shark species page