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
ReefPort Douglas
Phil's Backside (Agincourt Reef)
A massive coral slope and deep bommies with some of the largest giant clams on the Port Douglas reefs.
ReefPort Douglas
Sandbox (Opal Reef)
Shallow staghorn gardens and sand patches with a resident barracuda school – a relaxed final dive.
ReefPort Douglas
Sno (Opal Reef)
An all-rounder wall-and-reef-top site with turtles, sharks and a shallow safety-stop reef; recovered coral after crown-of-thorns…
ReefPort Douglas
St Crispin Reef
Maze of sandy channels between soft-coral mounds – the 'Flower Garden' – on a quiet four-mooring outer reef.
WallPort Douglas
The Point (Agincourt Reef 3)
Shelf-edge point with 30 m+ visibility, a stepped wall dropping into the abyss, and sharks and pelagics working the current.
ReefPort Douglas
Undine Reef
Shallow coral gardens and a sand cay you can step onto, 25 minutes off Cape Tribulation.
ReefPort Douglas
Wreck Site (Agincourt Reef 3)
Clear sandy lagoon with 12 m pinnacles and the coral-covered remains of a fishing boat in the shallows.
ReefPort Douglas
Acropolis (Opal Reef)
A shallow Acropora coral amphitheatre leading onto a nudibranch-rich wall.
Details need confirmationPinnacle/BommiePort Douglas
Advanced Bommie (Agincourt Reef)
Two huge coral towers rising from 40 m with a deep gutter – one of the sharkiest spots on Agincourt.
Details need confirmationReefPort Douglas
Anybody's (Agincourt Reef)
Wall dive followed by a winding return through coral-lined alleys.
Details need confirmationReefPort Douglas
Batt Reef
Large reef off Port Douglas, notable as the site of Steve Irwin's death in 2006; rarely dived.
Details need confirmationReefPort Douglas
Beautiful Mooring (Opal Reef)
Calm snorkel site with delicate staghorn thickets and several species of anemonefish.
Details need confirmationReefPort Douglas
Big Brother (Tongue Reef Sister reefs)
Current-swept reef corner with healthy coral, giant clams and big barracuda.
Details need confirmationReefPort Douglas
Blue Lagoon (Agincourt Reef)
A rarely visited, hard-to-reach lagoon dived only in perfect conditions.
Details need confirmationReefPort Douglas
Blue Lagoon (Opal Reef)
Calm, shallow lagoon coral gardens visited only on the right tide.
Details need confirmationReefPort Douglas
Cathedrals (Opal Reef)
Opal's rarely visited 'Blue Lagoon' with a maze of cathedral-like swim-throughs.
Details need confirmationReefPort Douglas
Chinaman Reef
Little-dived mid-shelf reef between Rudder and Opal reefs, an option on private charters.
Details need confirmationReefPort Douglas
Little Sister (Tongue Reef Sister reefs)
Reef corner with big boulder corals, huge clams and large barracuda holding in the current.
Details need confirmationPinnacle/BommiePort Douglas
Long Bommie (Opal Reef)
Satellite bommie from 25 m where plate corals are recovering from cyclone damage.
Details need confirmationReefPort Douglas
Mojo (Opal Reef)
Blue staghorn thickets near a reef gap with red bass schools, turtles and reef sharks.
Details need confirmationReefPort Douglas
New Seagull (Opal Reef)
Spur-and-groove buttress reef on Opal's ocean face, accessible only on calm wet-season days.
Details need confirmationReefPort Douglas
Nobody's (Agincourt Reef)
Wall, fish-covered bommies and a sandpit in one quiet dive.
Details need confirmationReefPort Douglas
North Bay (Agincourt Reef)
Shallow coral garden for beginners plus an easy drift along the outer wall for certified divers.
Details need confirmationReefPort Douglas
North Sno (Opal Reef)
Open 'moonscape' terrain on North Opal with visibility often exceeding 30 m.
Details need confirmation