Mackay Reef is a Great Barrier Reef site located 38 kilometres from the shore, accessible only by boat. The reef topography features shallow sections starting at 1 metre, sloping to a maximum depth of 30 metres with an average of 18 metres. Conditions are variable, with visibility ranging from 15 to 25 metres and currents that can shift from mild to strong. The site is suitable for beginners, though caution is required around sharp coral. Water temperatures fluctuate between 24C and 29C throughout the year. Local operators provide air fills, equipment rental, and guided tours. Divers and snorkellers should follow all boat crew briefings regarding site safety and local conditions.

East Hope Island at St Crispin Reef offers a combination of wall and drift diving suitable for beginners. The site features a shallow reef starting at 5 metres that extends to a drop-off reaching 25 metres. Visibility varies between 10 and 35 metres, with moderate currents present. Access is strictly by boat, and guided tours are recommended due to potential current changes near the point. Species recorded around this area include Napoleon Wrasse, Ornate Ghostpipefish, Regal Angelfish, Titan Triggerfish, Broadclub Cuttlefish, Giant Moray, Giant Clam, Whitetip Reef Shark, Day Octopus, Harlequin Sweetlips, Indian Lionfish, various wrasses, Sixbanded Angelfish, and Sling-jaw Wrasse. Stinger season occurs from November to May, and protective suits are recommended.

China Wall is a vertical drop-off on Tongue Reef that descends from 25 to 40 metres. This deep dive site is accessible only by boat and is suited for intermediate divers. The wall features gorgonias, sea whips, and nudibranchs, with turtles and reef fish frequently observed. Divers experience mild currents, typically around 0.25 knots, allowing for a gentle drift along the reef face. Visibility ranges from 15 to 30 metres. Due to the depth, divers must monitor nitrogen narcosis and decompression limits closely. Stonefish are present on the reef, so avoid touching any surfaces. The site is remote, and immediate medical assistance is not available.

Tokyo Drift at Agincourt Reef is a boat-accessible site featuring a dramatic wall and reef pinnacles. Divers typically start in the shallows at 5 metres before descending along the wall, which reaches depths of 50 metres with an average of 16 metres. The site is suitable for beginners, offering a controlled environment to practice drift diving techniques in moderate currents. Visibility ranges from 10 to 30 metres. Species recorded around this area include Napoleon Wrasse, Titan Triggerfish, and various wrasses. Stinger suits are recommended between November and May due to seasonal jellyfish. Reef sharks are present in deeper sections, and boat charters provide full facilities including equipment rental and guided tours.

Big Buoy at Agincourt Reef is a boat-only site featuring a reef wall and pinnacles that descend from 5 to 40 metres. The site is known for its moderate currents, which facilitate drift dives along the structure. Divers should maintain solid buoyancy control to manage the flow, as conditions can become challenging on certain tidal cycles. Visibility typically ranges from 10 to 35 metres. Due to the presence of boat traffic, surface awareness is essential. The site is suitable for intermediate divers, with the wall and pinnacles offering varied profiles. Titan Triggerfish may be aggressive during their breeding season, and divers should remain cautious of sharp coral and deep sections.

Undine Reef, located off the coast of Queensland, offers a varied underwater topography ranging from 5 to 30 metres, with an average depth of 15 metres. This site is accessible from the shore and is suitable for beginners, though conditions vary. Visibility typically spans 10 to 30 metres. Divers and snorkellers should be aware of mild currents that can change without warning, making it advisable to time activities around slack water. Hazards include jellyfish, cone snails, stonefish, sea urchins, and sharp coral. Always shuffle your feet when entering or exiting the water and exercise caution regarding hand and foot placement to avoid contact with hazardous marine life.

Castle Rock is a ribbon reef site located on the outer edge of Agincourt Reef. The topography features a reef structure that descends from the shallows to a depth of 25 metres, incorporating pinnacles, walls, and drop-offs. Access is exclusively by boat, with visibility typically ranging between 15 and 30 metres. While the site is suitable for beginners in shallower sections, divers must remain aware of potential strong currents and vertical currents near wall sections. Water temperatures fluctuate between 25C and 29C throughout the year. Protective suits are recommended during stinger season, which runs from November to May.

Harrys Bommie is a reef site located at Agincourt Reef, featuring a consistent depth of 16 metres. The topography consists of a reef structure that is suitable for beginners comfortable with this depth. Access is exclusively by boat, with a typical dive duration of 45 minutes. Visibility varies between 10 and 30 metres. While currents are generally mild, a narrow gap in the reef is known to be current-prone. Divers should be aware of potential thermoclines and the presence of marine stingers between November and May, during which time wearing a full-body stinger suit is recommended. The site is serviced by boat charters and guided tours.