Queensland
Diving in Port Douglas
Port Douglas boats work the Agincourt ribbon reefs on the very edge of the continental shelf, where the water is clearer and the coral generally healthier than on the Cairns day-boat reefs. Sites like Castle Rock, the Nursery Bommie, Barracuda Bommie and the Wreck Site have swim-throughs, pelagics and reliable 20 m-plus visibility. The Low Isles and Opal Reef are closer, shallower options.
THE LOCAL PLANNING BRIEF
Understand the options around Port Douglas
Keep Port Douglas departure arrangements distinct from Cairns
When comparing northern reef trips, check the actual port rather than relying on a broad Cairns-and-Port-Douglas description. Accommodation, transfers and meeting times can change the practical choice even when the trips sound similar. Ask the operator to describe its proposed itinerary and explain which destinations depend on conditions. If arriving from another town, confirm the road transfer separately rather than assuming it is included in the boat fare.
One useful question: Does this booking depart from Port Douglas, and is transport from our accommodation included?
What this regional directory records Counts describe published records, not bookable trips or confirmed open sites.
There are 62 published site records in Port Douglas. The recorded categories include reef (44), pinnacle/bommie (10), drift (4), wall (3). These categories reflect the database; they are not a ranking, a conditions report or an assessment of your suitability.
Use the Port Douglas 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 Port Douglas?
Begin with the individual site and its source notes, then discuss the proposed trip with a local provider. The 62 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 Port Douglas 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
Pinnacle/BommiePort Douglas
Barracuda Bommie (Agincourt Reef 2)
Circling barracuda school over a coral pinnacle; excellent snorkelling on the shallow garden around it.
Pinnacle/BommiePort Douglas
Bashful Bommie (Opal Reef)
Double-sided bommie with a sea-fan wall on a deep channel, a sheltered clam garden, and a very friendly Maori wrasse.
Pinnacle/BommiePort Douglas
Castle Rock (Agincourt Reef 1)
A 24 m exposed wall on one side and a sheltered coral garden on the other; one of the better Agincourt sites for sharks and big…
WallPort Douglas
Gary's Gut (Agincourt Reef 4)
Dramatic 5–40 m wall with large fan corals and soft corals – the deepest dive on Agincourt 4.
Pinnacle/BommiePort Douglas
Harry's Bommie (Agincourt Reef 4)
Instructors' favourite garden of pinnacles regularly visited by juvenile grey reef sharks and occasionally mantas.
DriftPort Douglas
Horseshoe Reef (Agincourt Reef 2)
Drift along a wall covered in shimmering blue fusilier schools with trevally and mackerel hunting through them.
Pinnacle/BommiePort Douglas
Nursery Bommie (Agincourt Reef)
Stunning 24 m pinnacle draped in fans and soft corals, circled by sharks, barracuda and schooling fish – regarded as one of the…
ReefPort Douglas
Phil's Reef (Agincourt Reef 3)
Huge tiers of plate coral sheltering groper and whitetips; giant clams and cuttlefish on a compact, shallow reef.
ReefPort Douglas
Stonehenge (Agincourt Reef 3)
Coral pillars and arches forming swim-throughs, with some of the healthiest hard coral in the Port Douglas area.
ReefPort Douglas
The Chapel (Agincourt Reef 4)
Swim-throughs, dense anemone fields with clownfish, and grey reef sharks on a compact patch reef.
DriftPort Douglas
The Gap (Agincourt Reef 3)
Shallow gutter drift beside a reef wall riddled with grottos; big sweetlips schools and groper.
ReefPort Douglas
The Gardens (Agincourt Reef 2)
Bright, shallow boulder-coral garden with excellent visibility; often done as an effortless drift.
ReefPort Douglas
The Point (Agincourt Reef 4)
Southern point of Agincourt 4 with magnificent coral and big schools of red bass, sweetlips and trevally.
Pinnacle/BommiePort Douglas
Three Sisters (Agincourt Reef 4)
Three coral bommies close to the mooring surrounded by huge fish schools and young grey reef sharks.
ReefPort Douglas
Turtle Bay (Agincourt Reef 2)
Sheltered bay with a coral wall and a resident large loggerhead turtle often seen in summer.
ReefPort Douglas
West End (Agincourt Reef 2)
The largest swim-through caves on Agincourt plus a very large, friendly Maori wrasse.
ReefPort Douglas
Whaler Point (Agincourt Reef 1)
Coral-rich southern point of Agincourt 1 with sharks, rays and barracuda passing along the edge; easy out-and-back layout.
ReefPort Douglas
Blue Buoy (Opal Reef)
Reliable turtle encounters plus pipefish and razorfish; can be linked with Wild West.
ReefPort Douglas
Coronation Corner (Agincourt Reef 3)
Clear-water southern corner of Agincourt 3 where sharks and barracuda work the current.
ReefPort Douglas
Flower Gardens (St Crispin Reef)
Soft-coral 'flower garden' near St Crispin's southern gap with rabbitfish pairs and nudibranchs.
DriftPort Douglas
Helm's Deep Drift (Agincourt Reef 2)
Tidal channel drift between Agincourt reefs 2A and 2B with grey reef sharks, turtles and barramundi cod.
WallPort Douglas
Izzy's Wall (Agincourt Reef 2)
Steep 5–30 m wall with juvenile grey reef sharks and turtles; often run as a drift.
IslandPort Douglas
Low Isles
Snorkel straight off a coral cay beach with a high chance of turtles, 30 minutes from Port Douglas; historic 1878 lighthouse.
ReefPort Douglas
Mackay Reef
Giant clam gardens, big turtles and a white-sand cay on a quiet, exclusive reef.