Silversonic Dive Sites — Agincourt Reef
Departing Port Douglas, Silversonic visits a selection of over 35 stunning and exclusive World Heritage reef sites at the Agincourt Reefs, on the very outer edge of the Great Barrier Reef. These special "ribbon" reefs run parallel to the Continental Shelf beside the Coral Sea trench and are recognised as among the most pristine ecosystems on the reef — crystal-clear water, rich coral growth and spectacular marine life.
Three sites, chosen daily. Silversonic dives three different sites each day, selected from across the four Agincourt reefs to suit the prevailing weather and conditions — so no two trips are quite the same. Agincourt Reef 1 Agincourt Reef 2 Agincourt Reef 3 Agincourt Reef 4Agincourt Reef 1
At the southern end of the Agincourt chain, Reef 1 showcases rich coral diversity and marine life across its distinctively separate reef structures.
Rating: Novice – Intermediate | Visibility: 8 – 35m | Depth: 5 – 24m
Whaler Point
Max 20m · Vis 8–30mA beautiful site rich in coral diversity — boulder, staghorn, plate and abundant soft corals.
Look for: sharks, rays, barracuda, oceanic sweetlip, shoaling fish
Castle Rock
Max 24m · Vis 8–35mAn unusual patch reef with a 24-metre exposed wall and a spectacular garden reef on the sheltered side — its position draws in the bigger marine life.
Look for: sharks, rays, groper, moray eels, anthias
Agincourt Reef 2
From Nursery Bommie — regarded as one of the best dive sites in the region — to wall diving at Izzy's Wall, Agincourt 2 packs in the variety.
Rating: Novice – Intermediate | Visibility: 8 – 30m | Depth: 5 – 30m
Nursery Bommie
Max 24m · Vis 12–30mA stunning 24-metre pinnacle surrounded by an amazing variety of marine life — considered one of the best sites in the area.
Look for: sharks, stingrays, barracuda, trevally, moray eels
Barracuda Bommie
Max 22m · Vis 15–30mA fantastic pinnacle with schools of barracuda circling the bommie and great fish life including lionfish. Sandy shallows covered in boulder corals suit snorkellers too.
Look for: barracuda, dogtooth tuna, fairy basslets, fusiliers
Izzy's Wall
Max 30m · Vis 12–30mA classic wall and drift dive along the reef edge.
Look for: turtles, sharks, baby whaler sharks, fusiliers, anthias
Turtle Bay
Max 22m · Vis 10–30mA sheltered spot at the reef's northern end, home to a large loggerhead turtle often seen in summer. A short swim reaches the reef front where pelagics patrol.
Look for: white tip reef sharks, sweetlips, giant clams, trevally
West End
Max 15m · Vis 8–25mA magical garden reef with frequent visits from a very large Maori wrasse — and the largest swim-through caves in the area.
Look for: Maori wrasse, potato cod, blue fusiliers, parrotfish
Horseshoe Reef & The Gardens
Max 20m · Vis 12–30mOften dived as drifts — luminescent blue fusiliers hug the walls at Horseshoe while trevally and red bass patrol, and The Gardens' shallow boulder-coral lagoon delivers exceptional visibility.
Look for: humphead parrotfish, Maori wrasse, mackerel, titan triggerfish
Agincourt Reef 3
From sandy lagoons studded with coral pinnacles and an old fishing boat wreck, to a fascinating reef wall dotted with small grottos at The Gap.
Rating: Novice – Intermediate | Visibility: 10 – 40m | Depth: 5 – 30m
Wreck Site
Max 24m · Vis 12–40mA sandy lagoon littered with imposing 12-metre pinnacles, with the remains of a Taiwanese fishing vessel resting in the shallows.
Look for: red bass, spangled emperor, white tip reef sharks, coral trout
The Gap
Max 12m · Vis 12–25mA lagoon-style gutter close to the reef crest — drift dives and snorkels along a fascinating wall pocked with small grottos.
Look for: golden goatfish, schooling sweetlips, groper
Stonehenge
Max 20m · Vis 10–30mRich coral diversity and some awesome swim-throughs.
Look for: giant clams, clownfish, cuttlefish, reef sharks
Phil's Reef
Max 16m · Vis 10–30mA stunning patch reef with a spectacular array of corals — huge plates providing perfect ambush grounds for a variety of groper.
Look for: groper, cuttlefish, hussar snapper, blue spot lagoon rays
Coronation Corner
Max 25m · Vis 12–40mAt the southern end of Agincourt Reef 3.
Look for: sharks, cuttlefish, barracuda, sweetlips
Agincourt Reef 4
At the northern end of the chain, Agincourt 4 offers a rich tapestry of coral and marine diversity — from the pretty garden site of the Three Sisters to the plunging wall at Gary's Gut.
Rating: Novice – Intermediate | Visibility: 10 – 40m | Depth: 5 – 40m
Harry's Bommie
Max 16m · Vis 10–30mA stunning garden reef scattered around pinnacles and patch reefs — a favourite amongst dive instructors, with regular visits from juvenile grey reef whalers and occasional manta rays.
Look for: sharks, rays, groper, moray eels, anthias
Three Sisters
Max 20m · Vis 15–30mA pretty garden site with three prominent bommies just 50 metres from the mooring, often visited by juvenile grey reef whalers and huge schools of congregating fish.
Look for: grey reef whalers, white tips, spangled emperor, stingrays
The Chapel
Max 18m · Vis 10–35mA stunning patch reef of plate, boulder and staghorn corals and seafans, threaded with swim-throughs — perfect habitat for sea anemones and their resident clownfish.
Look for: grey reef whalers, cuttlefish, giant clams, turtles
Gary's Gut
Max 40m · Vis 12–40mA terrific wall plunging from 5 to 40 metres — swim out and look back at the drop to appreciate the sheer scale. A great contrast to the garden sites.
Look for: white tip reef sharks, fan corals, unicorn fish, soft corals
The Point
Max 25m · Vis 15–30mAn excellent site at the southern end of Reef 4 with magnificent coral cover, large schools of red bass and Goldmann's sweetlips, and cruising barracuda.
Look for: red bass, Maori wrasse, grey reef sharks, big eye trevally
Dive Agincourt Reef — Silversonic from Port DouglasDive sites are selected daily by the crew based on prevailing weather and conditions.
