Queensland
Diving in Swain Reefs
The Swains are a maze of several hundred reefs on the outer edge of the southern Great Barrier Reef, 150–250 km off Gladstone and Mackay, visited by a few liveaboards and fishing charters. Walls, drop-offs, sharks and coral that sees almost no divers.
THE LOCAL PLANNING BRIEF
Understand the options around Swain Reefs
What this regional directory records Counts describe published records, not bookable trips or confirmed open sites.
There are 16 published site records in Swain Reefs. The recorded categories include reef (10), wall (3), sinkhole/cenote (2), pinnacle/bommie (1). These categories reflect the database; they are not a ranking, a conditions report or an assessment of your suitability.
Use the Swain Reefs site cards to compare recorded access and depth, then open the individual pages for the map accuracy and source notes. Sites grouped in a region are not necessarily close enough to combine in one day.
Research operators in Queensland →Ask before booking
- Which port and vessel will run our trip?
- Is the named reef a likely itinerary or a confirmed destination?
- What changes if our island transfer or boat departure moves?
Save the answers with the contact name and date. Separate confirmed arrangements from items still waiting for a reply.
Record your trip questions →Questions, answered
How do I choose a dive in Swain Reefs?
Begin with the individual site and its source notes, then discuss the proposed trip with a local provider. The 16 published records are research options, not a list of trips available today. Match the plan to your training, recent experience and the operator’s current requirements.
When should I visit Swain Reefs for diving?
Choose dates with a provider who runs the activity you want, then discuss seasonal patterns, recent conditions and alternative itineraries. A generic best-month claim cannot establish the conditions at your exact site or guarantee a wildlife encounter.
Can I use these maps to enter or navigate a dive site?
No. Recorded and approximate map positions support orientation only. Confirm the exact access, permissions, meeting point and route with the responsible local provider or manager.
Regional planning context: Tourism and Events Queensland — accessing the Great Barrier Reef ↗. Directory counts come from published YouDive records. Individual site claims remain subject to their source and review notes.
Dive sites in this region
WallSwain Reefs
Blue Line Lagoon (Swain Reefs)
A circular reef and drop-off at the northern limit of southern charters, with sharks, grouper and sea snakes.
Details need confirmationReefSwain Reefs
Central Reef (Swain Reefs)
Shallow coral gardens suited to macro photography.
Details need confirmationSinkhole/CenoteSwain Reefs
Cockatoo Reef Blue Hole (Pompey Complex)
A near-circular, coral-rimmed drowned sinkhole up to 295 m across and 40 m deep – one of the GBR's rare blue holes.
Details need confirmationReefSwain Reefs
East Cay (Swain Reefs)
A maze of bommies, gutters and staghorn thickets with sea snakes and big fish.
Details need confirmationPinnacle/BommieSwain Reefs
Gannet Cay (Swain Reefs)
Fish-packed coral pinnacles to 35 m beneath a protected seabird rookery, with sharks and mantas.
Details need confirmationReefSwain Reefs
Hixson Cay (Swain Reefs)
A sheltered anchorage with bright shallow coral gardens and sharks and pelagics deeper.
Details need confirmationReefSwain Reefs
Hook Reef (Swain Reefs)
Coral garden complex with excellent fish and invertebrate life, recovering well.
Details need confirmationReefSwain Reefs
Horseshoe Reef (Swain Reefs)
The Swains' most varied reef: a big sheltered lagoon, deep walls to 35 m and a wreck site.
Details need confirmationReefSwain Reefs
Lavers Cay (Swain Reefs)
Ledges and gutters home to giant grouper up to 2 m.
Details need confirmationWallSwain Reefs
Middle Cay (Swain Reefs)
A deep drop-off hung with huge yellow and red gorgonian fans.
Details need confirmationReefSwain Reefs
Mystery Cay (Swain Reefs)
Coral pinnacles where mantas come to cleaning stations in winter.
Details need confirmationReefSwain Reefs
Sandshoe Reef (Swain Reefs)
Invertebrate-rich coral gardens full of flatworms, nudibranchs and sea stars.
Details need confirmationReefSwain Reefs
Sinker Reef (Swain Reefs)
A maze of deep gutters through coral gardens, with batfish, grouper and sea snakes.
Details need confirmationWallSwain Reefs
Snake Reef (Swain Reefs)
Deep, colourful Swains walls to 40 m with pelagic schools – for experienced divers only.
Details need confirmationReefSwain Reefs
Taiwan Reef (Swain Reefs)
A sheltered lagoon of colourful coral and fish schools, recovering well from COTS damage.
Details need confirmationSinkhole/CenoteSwain Reefs
The New Blue Hole (Pompey Complex)
A 100 m-wide blue hole with sheer walls reported to plunge to 90 m – an expedition-only dive.
Details need confirmation