Top 10 Dive Sites in Vietnam
Vietnam's coastline stretches almost 3,500 kilometres from the Gulf of Tonkin to the Gulf of Thailand, and the diving that exists along it is varied in ways that most visitors do not expect. The most developed dive hubs — Nha Trang, Phu Quoc, and the Cham Islands near Hoi An — offer easy certification diving and colourful reefs. The less-visited outer sites, including Con Dao Archipelago in the south and the Spratly-adjacent waters of the far offshore, are genuinely remote. Water temperatures hover between 25 and 29 °C along the central and southern coast, visibility averages 10–20 metres on good days, and a 3 mm wetsuit is comfortable for most of the year. Currents vary from gentle to substantial depending on site exposure and tidal state. Open the map to explore Vietnam's dive geography before you plan your route.
1. Hon Mun Marine Protected Area, Nha Trang
Hon Mun is the centrepiece of Nha Trang Bay's diving and one of Vietnam's few formally gazetted marine protected areas. The island's reefs descend in a series of terraces from 5 metres to about 30, and the coral variety — particularly on the north-facing slope — is among the best in the country. Lionfish, moray eels, blue-spotted rays and large schools of sweepers fill the structure. Visibility averages 10–15 metres, occasionally pushing to 20 metres in the dry season. Open Water certification is sufficient for the main reef; the deeper terrace edges benefit from Advanced. Best season: February through August, before the south-west monsoon brings reduced visibility to the bay.
2. Turtle Dive Site, Nha Trang
As the name suggests, Turtle is the most reliable turtle-sighting site in the Nha Trang Bay cluster. A gently sloping reef from 5 to 22 metres hosts hawksbill and green turtles that have become habituated to divers over many years of consistent encounters. The coral at Turtle is not the densest in the bay, but the accessible depth and calm conditions make it an excellent site for less experienced divers and for underwater photography. A morning dive here can produce six or seven turtle encounters in a single bottom time. Operated by multiple dive centres from Nha Trang town; a short 20-minute boat ride.
3. Angel Dive Site, Nha Trang
Angel is a pinnacle site near Hon Mun where a granite outcrop rises from the sandy bottom at 28 metres to within about 8 metres of the surface. The pinnacle is encrusted with sea fans and wire corals, and the current that sweeps around it concentrates fish life: large Napoleon wrasse, jackfish in loose schools, and hunting barracuda hovering in the blue water above. Angel is the most current-exposed of the main Nha Trang sites and is best suited to Open Water divers comfortable in mild drift conditions. An SMB (surface marker buoy) is recommended. Visibility here tends to be better than in the bay proper, frequently reaching 15–20 metres.
4. Rainbow Divers Sites, Nha Trang
Rainbow Divers is one of Vietnam's longest-established dive operations and its fleet dives a number of exclusive or semi-exclusive sites along the outer islands of Nha Trang Bay, including the wall and cave systems around Hon Tre and Hon Mot. These outer sites see fewer divers than the Hon Mun cluster and reward the extra boat time with noticeably undisturbed marine life. Cuttlefish are common in the crevices, and the cave systems provide interesting navigation challenges. Best dived during the dry season from January through August.
5. Scuba Dive Centre Sites, Phu Quoc
Phu Quoc Island in the Gulf of Thailand is Vietnam's largest island and its dive scene has expanded rapidly since the island's development boom. The reefs around An Thoi Archipelago at Phu Quoc's southern tip sit in clearer water than the northern coast and offer hard coral at 10–25 metres with an impressive variety of reef fish. Seahorses are found reliably in the seagrass beds of sheltered sites, and the sandy channels between the outer islands host jawfish, garden eels, and blue-spotted ribbontail rays. The Gulf of Thailand has less dramatic visibility than the South China Sea sites — averaging 8–12 metres — but current is generally mild and conditions suit Open Water divers well. Best season: November through April.
6. Con Dao Archipelago, Ba Ria Province
Con Dao is a remote group of islands off Vietnam's southern coast that remained largely closed to tourism until the 2000s, and the diving reflects this history. Coral coverage at the main sites around Con Son Island is exceptional by Vietnamese standards — hard corals that were not subject to dynamite fishing now extend across wide reef flats at 5–18 metres. Humphead parrotfish, schools of batfish, and regular whale shark sightings in season (April through July) distinguish Con Dao from the more heavily visited sites. Getting here requires a domestic flight or a long boat crossing; the logistical commitment deters casual visitors and preserves the experience for those who make the effort. Advanced certification beneficial; dive operators based on Con Son.
7. Hon Cau, Binh Thuan Province
Hon Cau (Cau Island) off the coast of Binh Thuan Province is a protected marine area with some of the highest fish biomass per square metre of any site in Vietnam outside the offshore atolls. The reef systems here were surveyed in the early 2000s and found to have coral diversity comparable to Nha Trang before that bay experienced development pressure. Visibility runs 10–20 metres in season. Hon Cau is accessible from Phan Thiet by boat, though the number of dive operators serving the site is limited. Divers willing to arrange logistics independently will find an uncrowded reef with grouper, wrasse, rays and the occasional reef shark in numbers that suggest the protection is working.
8. Cham Islands, Quang Nam Province
The Cham Islands (Cu Lao Cham) off Hoi An form a UNESCO Biosphere Reserve, and their protected status has produced a reef system that stands in notable contrast to heavily dived sites elsewhere. Hard coral recovery has been observed since the reserve's establishment, and fish diversity is good for central Vietnam. The sites are shallow — maximum around 18 metres on the main reef — and suit Open Water divers and beginners doing their check-out dives. Colourful nudibranchs appear in high density from April through June. The boat ride from Hoi An takes about an hour; visibility improves in the dry season from February to August.
9. Whale Island, Khanh Hoa Province
Whale Island (Hon Ong) sits north of Nha Trang Bay in a relatively unspoiled stretch of coast. The island's single resort runs the diving and limits daily visitor numbers. The reef reaches 25 metres on the outer edges, with sea fans and barrel sponges at depth. The isolation means fish are large relative to Nha Trang standards — grouper and snapper in sizes that reflect minimal fishing pressure. Whale sharks are occasionally sighted in the channel from March through May. A genuinely peaceful site for divers stepping outside the main Nha Trang circuit.
10. Ly Son Island, Quang Ngai Province
Ly Son is a volcanic island off Quang Ngai Province in central Vietnam, formed by two extinct volcanoes whose lava flows created an irregular seabed of lava tubes, arches and broken columns at 10–25 metres. This geological distinctiveness makes the site visually unusual — entirely different from the granite and coral formations elsewhere in the country. Visibility can reach 20 metres outside the rainy season. The dive infrastructure on Ly Son is modest; this is not a destination for divers expecting full resort facilities. But for those willing to stay simply and dive with local operators who know the site, Ly Son offers an experience that no other site in Vietnam replicates. Best season: February through July.
Planning Your Vietnam Dive Trip
Vietnam's monsoon pattern divides the country such that when conditions are poor in the south they are often good in the centre, and vice versa. Nha Trang and Phu Quoc are generally best from January through August; the central sites around Hoi An and Da Nang dive better in the same window but are more exposed during the northern wet season from September through November. Con Dao and the southern offshore sites peak from April through July. Nha Trang is the most developed dive hub, with multiple operators, full equipment rental, and courses from beginner through instructor. PADI is the dominant agency throughout the country. Open the map to plan routes between islands and find operators along Vietnam's coastline.