Gladstone / Yeppoon (Rosslyn Bay) / Mackay
14 site records refer to this town or area.
Look for operators around Gladstone / Yeppoon (Rosslyn Bay) / Mackay →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.
Custom YouDive mascot art inspired by Queensland. An imaginative illustration, not a photograph or map of this destination.
Your bearings, in a minute
Swain Reefs at a glance
Start with the local site mix, explore the map and find people to ask about your trip.
- Explore
- 16 site records
- Recorded settings
- Reef · Wall · Sinkhole/Cenote
- Map coverage
- 16 locations to explore
- Plan with local help
- Meet the listed operators
Directory counts describe published records, not bookable trips. Location confidence is shown separately in the map list. How we check information →
Sources, authorship and review status
Prepared by YouDive editorial with AI assistance. No firsthand visit, equipment test or instructor review is implied.
Independent specialist review: pending. We publish a reviewer’s name, qualifications, date and exact review scope only after the review has actually happened.
Who can contribute and how reviews work →Find your bearings
Explore Swain Reefs on the map
Compare where the recorded sites sit, then open a site to read its access and source notes. Locations are for orientation, not marine navigation or entry instructions.
16 matching records · 16 with a map location · 0 without a usable position.
Blue Line Lagoon (Swain Reefs)
Wall · 5–30 m
Approximate area
Central Reef (Swain Reefs)
Reef · 2–20 m
Approximate area
Cockatoo Reef Blue Hole (Pompey Complex)
Sinkhole/Cenote · 1–35 m
Approximate area
East Cay (Swain Reefs)
Reef · 1–25 m
Approximate area
Gannet Cay (Swain Reefs)
Pinnacle/Bommie · 7–35 m
Approximate area
Hixson Cay (Swain Reefs)
Reef · 2–30 m
Approximate area
Hook Reef (Swain Reefs)
Reef · 5–20 m
Approximate area
Horseshoe Reef (Swain Reefs)
Reef · 2–35 m
Approximate area
Lavers Cay (Swain Reefs)
Reef · 5–20 m
Approximate area
Middle Cay (Swain Reefs)
Wall · 10–40 m
Approximate area
Mystery Cay (Swain Reefs)
Reef · 5–20 m
Approximate area
Sandshoe Reef (Swain Reefs)
Reef · 10–30 m
Approximate area
The local notebook
Where should you start in Swain Reefs?
Use the actual places attached to the local records to narrow your research. These are recorded nearby towns and areas, not verified departure points or accommodation recommendations.
Mackay
2 site records refer to this town or area.
Look for operators around Mackay →Different outings to look into
| Local example | Recorded nearby place | Recorded access | Follow the evidence |
|---|---|---|---|
| Gannet Cay (Swain Reefs) | Gladstone / Yeppoon (Rosslyn Bay) / Mackay | Boat (multi-day/liveaboard) | Recorded source ↗ |
| Central Reef (Swain Reefs) | Gladstone / Yeppoon (Rosslyn Bay) / Mackay | Boat (multi-day/liveaboard) | Recorded source ↗ |
| Cockatoo Reef Blue Hole (Pompey Complex) | Mackay | Boat (multi-day/liveaboard) | Recorded source ↗ |
| Blue Line Lagoon (Swain Reefs) | Gladstone / Yeppoon (Rosslyn Bay) / Mackay | Boat (multi-day/liveaboard) | Recorded source ↗ |
How to use this shortlist
Choose the named outing that interests you first. Compare its recorded place and access with your accommodation plans, then obtain the actual meeting address and schedule from the provider. The site links show the underlying depth, location confidence and source notes. Similar town names or map positions do not establish that two outings can be combined in a day.
A closer look at Swain Reefs
Get a feel for the diving
Our Swain Reefs directory currently includes 16 published site records. The largest recorded category is reef (10 records). Use the mix below to decide what you would like to read about first.
Swain Reefs: what’s in the directory?
A visual guide to recorded site types. Counts show coverage, not popularity or current availability.
Source: published YouDive directory records for Swain Reefs. Bars use the same scale within this graphic; the longest is the largest category, not 100% of the destination.
A few local records to compare
Start with Gannet Cay (Swain Reefs), Central Reef (Swain Reefs), Cockatoo Reef Blue Hole (Pompey Complex). These are examples from different recorded categories, not a recommended route or a list of the best sites. Open each record for its sources, map and review notes.
| Site | Recorded type | Access | Depth |
|---|---|---|---|
| Gannet Cay (Swain Reefs) Details need confirmation | Pinnacle/Bommie | Boat (multi-day/liveaboard) | 7–35 m |
| Central Reef (Swain Reefs) Details need confirmation | Reef | Boat (multi-day/liveaboard) | 2–20 m |
| Cockatoo Reef Blue Hole (Pompey Complex) Details need confirmation | Sinkhole/Cenote | Boat (multi-day/liveaboard) | 1–35 m |
| Blue Line Lagoon (Swain Reefs) Details need confirmation | Wall | Boat (multi-day/liveaboard) | 5–30 m |
How the recorded depths compare
A dot shows a recorded maximum. A line joins the recorded minimum and maximum when both are available. These are site descriptions, not target depths or certification limits.
The table above contains the same depth values. Depth alone cannot establish suitability, and records may require correction. Source: the linked site records.
Find your little corner of Queensland
A Queensland dive holiday starts with a more useful question than “Which reef?”: where will your actual day begin? Use the local records below to explore the setting, then connect that idea with a departure and the time you have available.
Choose the outing before the room
A mainland departure, an island stay and a multi-day boat trip have different rhythms. Write down the exact activity you want, who is joining and whether everyone plans to dive. Ask about meeting and return times before building accommodation and transfers around a promotional reef name. On a mixed trip, find out what non-divers can actually book on the same departure.
Give each day a job
Keep arrival, equipment fitting and your main diving outing visible as separate parts of the plan. If you hope to complete training during the trip, put the course schedule alongside the travel schedule. A free morning on a holiday calendar does not establish that a course session or reef departure will fit into it. Leave the unanswered details in your notes until the provider confirms them.
Make room for the unexpected
Compare the value of the whole outing, including guiding, equipment, meals and transfers. Ask what happens if the itinerary changes and which alternatives might be offered. That gives you something practical to compare between quotes. Seasonal research helps you choose dates; the actual departure still depends on current arrangements and the people operating the trip.
Three conversations worth having before you book
Mainland boat day
Which meeting point and return time apply?
Match transport to the actual departure.
Island-based stay
Which transfers and diving are separate bookings?
Keep each booking and payee visible.
Multi-day trip
Which sites are possibilities rather than promises?
Read the itinerary-change terms.
From “that looks lovely” to a plan
Make Swain Reefs your kind of dive trip
Find your starting point, meet the local options and keep your ideas together. You do not need to have the whole trip worked out yet.
Where are you on your diving journey?
I’m just getting started
Find out how a first course works, compare your options and get comfortable asking questions.
I’m ready to explore more
Connect your next outing with useful reading and a conversation about the right training and support.
I’m thinking about teaching
Explore the professional pathway and prepare better questions for a training centre.
These are learning paths to explore, not prerequisites for every local site. Confirm the actual course, instructor and your readiness with the provider.
People to talk to about Swain Reefs
These profiles are based in the region or have a sourced link to one of its sites. Shown alphabetically, not as a quality ranking. Ask about the specific trip or course you want.
Listed in this region
Eastern Voyager
Gladstone
Open the profile for contact details and recorded services, then ask about current arrangements.
Meet this operator →Listed in this region
Kanimbla Charters
Gladstone
Open the profile for contact details and recorded services, then ask about current arrangements.
Meet this operator →Let’s put the pieces together
Start with the place and your questions. Add dates and prices once you have spoken with the people running the trip.
Open my trips
Creates a new trip with this destination, useful reading and starter questions. Saved on this browser; export a backup from My trips.
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
Search within Swain Reefs, or narrow the list to a recorded dive type. Open a site for its map, sources and access notes.
16 matching site records. Listings do not confirm current access or availability.
QLD
Wall
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 confirmationQLDReef
ReefSwain Reefs
Central Reef (Swain Reefs)
Shallow coral gardens suited to macro photography.
Details need confirmationQLDSinkhole/Cenote
Sinkhole/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 confirmationQLDReef
ReefSwain Reefs
East Cay (Swain Reefs)
A maze of bommies, gutters and staghorn thickets with sea snakes and big fish.
Details need confirmationQLDPinnacle/Bommie
Pinnacle/BommieSwain Reefs
Gannet Cay (Swain Reefs)
Fish-packed coral pinnacles to 35 m beneath a protected seabird rookery, with sharks and mantas.
Details need confirmationQLDReef
ReefSwain Reefs
Hixson Cay (Swain Reefs)
A sheltered anchorage with bright shallow coral gardens and sharks and pelagics deeper.
Details need confirmationQLDReef
ReefSwain Reefs
Hook Reef (Swain Reefs)
Coral garden complex with excellent fish and invertebrate life, recovering well.
Details need confirmationQLDReef
ReefSwain 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 confirmationQLDReef
ReefSwain Reefs
Lavers Cay (Swain Reefs)
Ledges and gutters home to giant grouper up to 2 m.
Details need confirmationQLDWall
WallSwain Reefs
Middle Cay (Swain Reefs)
A deep drop-off hung with huge yellow and red gorgonian fans.
Details need confirmationQLDReef
ReefSwain Reefs
Mystery Cay (Swain Reefs)
Coral pinnacles where mantas come to cleaning stations in winter.
Details need confirmationQLDReef
ReefSwain Reefs
Sandshoe Reef (Swain Reefs)
Invertebrate-rich coral gardens full of flatworms, nudibranchs and sea stars.
Details need confirmationQLDReef
ReefSwain Reefs
Sinker Reef (Swain Reefs)
A maze of deep gutters through coral gardens, with batfish, grouper and sea snakes.
Details need confirmationQLDWall
WallSwain Reefs
Snake Reef (Swain Reefs)
Deep, colourful Swains walls to 40 m with pelagic schools – for experienced divers only.
Details need confirmationQLDReef
ReefSwain Reefs
Taiwan Reef (Swain Reefs)
A sheltered lagoon of colourful coral and fish schools, recovering well from COTS damage.
Details need confirmationQLDSinkhole/Cenote
Sinkhole/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