Shelter Island in Hong Kong offers a shallow reef environment suitable for beginners, with depths ranging from the surface down to 9 metres. The site is accessible only by boat, and the mild currents make it a manageable location for snorkelling. Water temperatures fluctuate between 19C and 29C throughout the year, requiring appropriate thermal protection during cooler months. Visibility is variable and depends heavily on local weather, tidal movements, and seasonal changes. Due to active boat traffic in the area, snorkellers must remain vigilant when surfacing and are advised to use a brightly coloured snorkel vest or tow float for visibility.

Pak Shui Wun is a shore-entry snorkel site located at Shelter Island, Hong Kong. The site features a shallow reef structure ranging from the surface to 4 metres in depth, making it suitable for beginners. Water temperatures fluctuate between 19 and 29 degrees Celsius throughout the year. While the current is generally mild, snorkellers should remain vigilant for boat traffic in the area. Visibility at the site is variable. Species recorded around this area include nudibranchs, lionfish, dragonets, anemonefish, butterflyfish, wrasses, puffers, rock cod, and banded coral shrimp.

Clear Water Bay at Shelter Island in Hong Kong is a marine site featuring both natural and artificial reefs. Suitable for beginners, the site offers depths ranging from 3 to 8 metres. Divers can access the water via shore or boat. Conditions are variable, with visibility typically between 3 and 10 metres and mild currents. Hazards include boat traffic, potential entanglement, low visibility, sharp coral, and surf. On-site facilities include parking, toilets, showers, changing rooms, and a cafe. Water temperatures fluctuate throughout the year, ranging from 19C in January to 29C in September.

Trio Island, located off South Ninepin Island, features a combination of natural reef and artificial reef structures. The site ranges in depth from 5 to 21 metres, with an average depth of 10 metres. Divers encounter mild currents, though conditions can vary, and visibility typically spans 5 to 15 metres. Access is strictly by boat, and the site is suitable for intermediate divers. Due to active boat traffic in the area, divers must deploy a surface marker buoy before ascending and remain vigilant during safety stops. The site is also suitable for night diving, with typical dives lasting around 45 minutes.

Sharp Island offers a shallow reef and artificial reef environment suitable for beginners. Accessible only by boat, the site features depths ranging from 1 to 15 metres with an average of 9 metres. Divers frequently encounter Spotfin Butterflyfish, Clark's Anemonefish, and White-spotted Puffer. Other common species include Stonefish, wrasses, and various butterflyfish. The site is also home to less common sightings such as Fingered Dragonet, Longhorn Cowfish, and Banded Coral Shrimp. Conditions vary with visibility between 5 and 15 metres and mild currents. Hazards include boat traffic, entanglement, and sharp coral. Night diving is permitted at this location, with typical dives lasting 45 minutes.

The Tombolo is a reef site located off Sharp Island, Hong Kong, featuring depths ranging from 1 to 12 metres with an average of 5 metres. Accessible only by boat, this site is suitable for beginners due to its mild currents. Visibility varies between 3 and 10 metres. Divers and snorkellers should exercise caution regarding sharp coral and active boat traffic in the area. A surface marker buoy is recommended for all ascents. Water temperatures fluctuate between 19C and 29C throughout the year. Toilets are available at the location. Typical dives last approximately 60 minutes.

Sharp Island offers a sheltered reef dive within the Sai Kung area, suitable for beginners. The site features a rocky substrate and coral formations at depths ranging from 6 to 15 metres, with an average depth of 8 metres. Divers can expect mild currents and visibility between 5 and 15 metres. Access is by boat, with typical dive times around 60 minutes. Water temperatures fluctuate significantly throughout the year, ranging from 19C in January to 29C in September. Hazards include boat traffic, entanglement risks, and sharp coral edges. Facilities including changing rooms and toilets are available for visitors.

Basalt Island, located near East Ninepin Island, features a reef environment suitable for beginners and snorkellers. The site ranges from the surface to a maximum depth of 13 metres. Divers frequently encounter Zebra Lionfish, Flamingo Tongue, and Clark's Anemonefish. Other species recorded here include Robust Ghost Pipefish, Chromodoris Nudibranch, Stonefish, Indian Lionfish, Scorpionfish, White-spotted Puffer, Flatworm, Pufferfish, Rock Cod, Starry Puffer, and various wrasses. Access is by boat only. Conditions, including visibility and current, are variable. Due to active boat traffic in the Sai Kung area, divers must deploy a surface marker buoy before ascent and remain aware of their surroundings.