Îlot Signal is a shallow reef and seagrass site located off the coast of Nouméa. Divers and snorkellers can explore depths ranging from 1 to 8 metres. The site features a reef drop-off and extensive seagrass beds. Marine life recorded here includes sea kraits, which are very common, alongside wrasses and rock cod. Less frequently, divers may encounter Napoleon wrasse, whitetip reef sharks, crocodile fish, harlequin sweetlips, zebra lionfish, day octopus, turkey moray, giant trevally, emperor angelfish, barrier reef anemonefish, and keyhole angelfish. Hazards include boat traffic, sharks, and sharp coral. Facilities at the islet include toilets and access to boat charters.

Îlot Larégnère is a reef and seagrass site located near Îlot Signal, New Caledonia. Accessible by boat, the site features a northern beach that provides entry into a lagoon. The topography consists of branching corals within a depth range of 1 to 10 metres, with an average depth of 4 metres. Conditions are generally suitable for beginners, with mild currents typically present. Snorkellers should remain aware of boat traffic in the area. Facilities at the islet include toilets. The site offers a 4/5 rating for snorkelling, with typical sessions lasting around 60 minutes.

Ilot Larégnère is a marine site featuring extensive seagrass beds and a vibrant reef system. Located 13 kilometres from the shore, the site requires boat access and is suitable for beginners. Depths range from the surface to 7 metres, with an average depth of 3 metres. Water temperatures fluctuate between 23C and 27C throughout the year. The area is subject to mild currents. Facilities at the site include toilets. Divers and snorkellers should be aware of potential hazards, including sharp coral and the presence of sharks in the area.

Le Humboldt is a deliberately sunk wreck located off Îlot Signal, serving as an artificial reef. The structure sits at a depth of 20 to 22 metres, making it a suitable site for intermediate divers to gain wreck experience. Access is by boat only. Visibility at the site ranges from 10 to 30 metres, with water temperatures fluctuating between 23C and 27C throughout the year. Divers should remain aware of potential strong currents and the significant depth of the surrounding area, which reaches 26 to 30 metres. The wreck allows for a methodical exploration of the hull and surrounding substrate.

Passe de Dumbéa is a deep reef drift dive located near Îlot Signal. This site features a reef wall ranging from 25 to 50 metres in depth, making it suitable for intermediate divers comfortable with significant depth and strong currents. Access is by boat only, and divers should time their entry with the outgoing tide to utilise the current. Visibility typically ranges between 10 and 30 metres, with water temperatures between 23 and 25 degrees Celsius. Due to the strong currents and depth, a surface marker buoy is essential for safety. Divers should monitor depth gauges closely and avoid contact with reef structures to prevent entanglement.

Îlot M'Bo is a small islet located in the northern lagoon of Nouméa, featuring a coral reef that encircles the island. The site offers a drop-off and reef environment suitable for snorkelers, with depths ranging from 2 to 10 metres and an average depth of 5 metres. Access is via the shore, with the reef located approximately 200 metres from the island. Conditions include moderate currents, and snorkelers should be aware of sharp coral. The water temperature fluctuates between 23C and 28C throughout the year. This site is well-suited for beginners, providing a 60-minute typical snorkel experience.

Îlot Maître is a nature reserve located in the Nouméa Lagoon, offering accessible snorkeling over seagrass beds and reef areas. The site is suitable for beginners, with depths typically ranging from 1 to 2 metres. Snorkellers can observe common species such as Lagoon Triggerfish, Pacific Sailfin Tang, and various goatfish. Less frequently, divers and snorkellers may encounter Common Seahorse, Whitetip Reef Shark, Day Octopus, and Masked Bannerfish. Entry is from the shore, and the area features mild currents. Be aware of boat traffic and jellyfish in the water. Facilities including equipment rental, a cafe, toilets, showers, and changing rooms are available on the islet.

Baie Des Citrons is a highly accessible shore snorkeling site located in Nouméa. The area features a combination of reef and seagrass habitats, with depths ranging from 1 to 6 metres and an average depth of 4 metres. Conditions are generally calm with mild currents, making it suitable for beginners. Snorkellers can explore the coral reef bordering both ends of the beach. Facilities at the site include parking, showers, a cafe, first aid services, and equipment rental. The water temperature fluctuates between 23C and 27C throughout the year. Potential hazards at this location include jellyfish and sharks.