Diving and Snorkelling in Con Dao 2026: Best Reefs in Southern Vietnam

Con Dao has the best diving in southern Vietnam. The national park designation means the reefs have more protection from fishing and anchoring than most Vietnamese dive sites. Coral coverage is higher, fish populations are denser, and the visibility is generally better than at comparable sites.

Why Con Dao diving is different

The key factor is the national park. Dynamite fishing, cyanide fishing, and coral harvest are prohibited and enforced with more rigour than at unprotected sites. The reefs around the offshore islands — Bay Canh, Hon Cau, Hon Tre — have recovered from historical damage and now support dense coral and diverse fish populations.

The diving is not Caribbean-standard, but by Vietnamese standards it is outstanding.

Best dive sites

Hon Cau (Haystacks): The most consistently recommended site. A series of coral pinnacles rising from 20–30m to within 5m of the surface. Soft coral coverage is excellent. Regular sightings of eagle rays, reef sharks (blacktip and whitetip), and large grouper. Suitable for experienced divers.

Bay Canh Reef: The reef system around the main turtle nesting island. Green sea turtles are regularly seen underwater here — one of the few places in Vietnam where turtle encounters are genuinely reliable. 8–22m depth. Mixed hard and soft coral.

Con Dao Wall: A wall dive on the east side of Con Son. 10–40m. Good visibility when conditions are right. Schooling fish, moray eels, and occasional manta ray sightings.

Ship Wreck: A small sunken vessel in accessible depths (15–20m). Marine growth has made it a good macro site — nudibranchs, seahorses, frogfish.

Visibility

Average visibility: 10–20m in dry season. July–September (monsoon approaching) can drop to 8–12m at some sites. The offshore islands (Hon Cau, Bay Canh) maintain better visibility than the sites closer to Con Son.

Dive operators

Con Dao has a small number of dive operators. All are based in Con Son town:

Con Dao Dive Centre: The most established operator. PADI courses available. 2-tank dives: ₫1,000,000–1,500,000 ($40–60). PADI Open Water: ₫6,000,000–8,000,000 ($240–320).

Rainbow Divers Con Dao: The same chain as Nha Trang and Phu Quoc. Consistent standards. Similar pricing.

Six Senses Dive Centre: Operates for resort guests and day visitors. More expensive but includes high-end equipment and small groups.

Snorkelling

The reefs accessible by snorkel are around Bay Canh Island (boat transfer required), the rocky headlands around Lo Voi, and the fringing reef at Dat Doc. Equipment rental: ₫50,000–100,000 ($2–4) per half day.

Snorkelling with a guide to Bay Canh reef gives the best chance of turtle encounters without scuba certification.

Season for diving

Best: April–October. Calm conditions, best visibility. November–March: Northeast monsoon. Rougher seas affect the offshore islands. Some dive sites may be inaccessible on rough days. Visibility can decrease. Diving is still possible but conditions are less reliable.