Southeast Asia · Vietnam
Nha Trang
High nudibranch diversity in granite boulder fields off the Vietnamese coast
Photo: Ilse Reijs and Jan-Noud Hutten · CC BY 2.0
Nha Trang is Vietnam's diving centre, working a cluster of granite islands inside the Hon Mun Marine Protected Area a short boat ride from the city. The coral has taken damage from decades of fishing and tourism, and nobody comes here for pristine reef — the draw is macro. Nudibranch diversity is very high, and the boulder fields and rock crevices hold frogfish, ghost pipefish, seahorses and cuttlefish. Conditions are calm and shallow, which makes it a cheap and popular place to train.
About diving in Nha Trang
The routine barely varies. Boats leave the town harbour in the morning, make a short run out to the island cluster, dive, anchor up for lunch and the surface interval, dive again and are alongside by mid-afternoon. The marine park fee is charged separately, usually collected on the day. Boats are shared and groups run large, with courses and fun divers on the same deck, so it is worth asking how many divers one guide will be taking before you book anything.
The rock underwater is the same granite that shapes the coastline: rounded blocks stacked into slopes, with gaps, short tunnels and shaded overhangs between them instead of continuous reef. That structure is what carries the diving. Every crevice is a hiding place, and the silt and rubble collecting between the blocks is where the small animals settle. Profiles stay shallow and flat, so a dive here is an hour of slow, deliberate searching rather than a descent, a tour and an ascent.
Which sites you get can move around, since parts of the protected area have been closed to diving at times while managers give damaged coral room to recover. That matters less here than it would elsewhere, because the small life is spread across every boulder slope in the bay rather than concentrated on one reef. The trade-off is an honest one: no current, no size, nothing happening in the water column. What you get instead is an hour of close-range looking, which is what the macro photographers come for.
Best time to dive Nha Trang
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Good | Prime | Prime | Prime | Prime | Good | Good | Good | Good | Fair | Off-season | Off-season |
| Sea surface | 25°C77°F | 25°C77°F | 26°C79°F | 28°C82°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 29°C84°F | 28°C82°F | 27°C81°F | 26°C79°F |
| Daytime high | 26°C79°F | 27°C81°F | 29°C84°F | 30°C86°F | 31°C88°F | 31°C88°F | 31°C88°F | 31°C88°F | 30°C86°F | 30°C86°F | 28°C82°F | 27°C81°F |
| Rain | 58 mm2.3 in | 25 mm1.0 in | 38 mm1.5 in | 45 mm1.8 in | 147 mm5.8 in | 151 mm5.9 in | 174 mm6.9 in | 166 mm6.5 in | 256 mm10.1 in | 292 mm11.5 in | 309 mm12.2 in | 177 mm7.0 in |
| Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|
| Good | Prime | Prime | Prime | Prime | Good |
| Sea surface | |||||
| 25°C77°F | 25°C77°F | 26°C79°F | 28°C82°F | 29°C84°F | 29°C84°F |
| Daytime high | |||||
| 26°C79°F | 27°C81°F | 29°C84°F | 30°C86°F | 31°C88°F | 31°C88°F |
| Rain | |||||
| 58 mm2.3 in | 25 mm1.0 in | 38 mm1.5 in | 45 mm1.8 in | 147 mm5.8 in | 151 mm5.9 in |
| Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|
| Good | Good | Good | Fair | Off-season | Off-season |
| Sea surface | |||||
| 29°C84°F | 29°C84°F | 29°C84°F | 28°C82°F | 27°C81°F | 26°C79°F |
| Daytime high | |||||
| 31°C88°F | 31°C88°F | 30°C86°F | 30°C86°F | 28°C82°F | 27°C81°F |
| Rain | |||||
| 174 mm6.9 in | 166 mm6.5 in | 256 mm10.1 in | 292 mm11.5 in | 309 mm12.2 in | 177 mm7.0 in |
2011–2025 averages. Sea surface: NOAA Coral Reef Watch, measured at the surface, so deeper water can run colder. Daytime high and rain: NASA POWER.
Feb–Sep is the season, with Mar–May clearest; the north-east monsoon from November to January brings rough seas and closes most operators.
Best months: February, March, April, May
Nha Trang water temperature and weather by month
The sea surface runs from 25 °C (77 °F) in January to 29 °C (84 °F) in September. Most rain falls from July to December, peaking at about 310 mm (12 in) in November; it stays largely dry from January to April. Daytime highs reach 31 °C (88 °F) in May and drop to 26 °C (79 °F) in January. The coldest water here is about 24 °C (75 °F), so pack a 3 mm full suit.
Dive types & marine life
Nudibranchs are the reason to slow down, and they are on the rock whenever boats are running. Expect morays wedged into the boulder gaps, cuttlefish and octopus over the rubble, and frogfish where a guide knows the spot. Turtles and barracuda pass through occasionally rather than dependably. Water is warmest through the middle of the year and at its clearest from March to May.
- Reef
- Muck & macro
- Cave & cavern
- Night
- Wall
- Nudibranchs
- Macro critters
- Frogfish
- Octopus & cuttlefish
- Reef fish swarms
- Sea turtles
- Barracuda
Best dive sites in Nha Trang
Reef
Stonefish, lionfish and octopus tucked into the rock
Reef
Named for the giant morays that hole up in it
Mun Island
The protected area's main island, with boulder slopes to 22 m.
Light House
Exposed point with the area's best coral and passing schools.
Small Wall
Short rock wall in 15 m, a reliable macro and night dive.
How to get to Nha Trang
Cam Ranh airport sits about 35 km south of the city, and the north-south railway and coastal coach routes connect Nha Trang to Ho Chi Minh City and Da Nang. Shops are in town and boats leave from the harbour, so day trips are the norm, with the occasional shore entry. Most operators stand down through the November and December monsoon swell.
Photos from Nha Trang
Ilse Reijs and Jan-Noud Hutten · CC BY 2.0
Ilse Reijs and Jan-Noud Hutten · CC BY 2.0
Ilse Reijs and Jan-Noud Hutten · CC BY 2.0
Nguyen Hung Vu · CC BY 2.0
Dive videos
Scuba Diving in Nha Trang Vietnam 🇻🇳 · World Nomac on YouTube
Vietnam's Underwater Paradise | Diving Hon Mun, Madonna Rock & Saint Hardy in Nha Trang · Diver's stories on YouTube
Photo credits
- A lionfish spreads its ornate fins over a rocky reef near Nha Trang, Vietnam by Ilse Reijs and Jan-Noud Hutten, CC BY 2.0, via Wikimedia Commons
- A pink skunk anemonefish swims among the tentacles of a sea anemone off Nha Trang by Ilse Reijs and Jan-Noud Hutten, CC BY 2.0, via Wikimedia Commons
- A pair of cream-and-black nudibranchs cross the reef near Nha Trang by Ilse Reijs and Jan-Noud Hutten, CC BY 2.0, via Wikimedia Commons
- A pale, camouflaged leaffish rests on the sandy seabed near Nha Trang by Ilse Reijs and Jan-Noud Hutten, CC BY 2.0, via Wikimedia Commons
- Snorkelers wade into clear turquoise water off Hon Mun Island near Nha Trang by Nguyen Hung Vu, CC BY 2.0, via Wikimedia Commons
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