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Overview
Hon Mun anchors Vietnam's first marine protected area, designated in 2001, and holds the country's richest reef — surveys credit Nha Trang Bay with roughly 1,500 marine species. Granite boulders and hard-coral slopes draw schools of damselfish, butterflyfish and anemonefish, while the sand and rubble between them hide nudibranchs, seahorses, frogfish and moray eels. Madonna Rock adds caverns and swim-throughs down to about 30 m, and the Hon Mun Wall drops past snapper and the occasional barracuda. Dry-season water runs clear and warm; the northeast monsoon stirs it up late in the year.
Briefing note
Inside the Hon Mun Marine Protected Area (Vietnam's first, established 2001) — a reef-protection fee applies and anchoring and collecting are restricted. Visibility is best in the Feb-Sep dry season; the Oct-Dec northeast monsoon brings wind, runoff and reduced visibility.
What you'll see
5 species curated- year-roundPink Anemonefish
- year-roundNudibranchs
- year-roundSeahorses
- rareBlacktip Reef Shark
- rareGreen Sea Turtle
Conditions
| Month | Water | Visibility | Current |
|---|---|---|---|
| Jan | 24–26 °C | 10–15 m | moderate |
| Feb | 24–26 °C | 12–20 m | mild |
| Mar | 25–27 °C | 15–25 m | mild |
| Apr | 27–29 °C | 15–30 m | mild |
| May | 28–30 °C | 15–30 m | mild |
| Jun | 28–30 °C | 15–30 m | mild |
| Jul | 28–30 °C | 15–30 m | mild |
| Aug | 28–30 °C | 15–30 m | mild |
| Sep | 28–29 °C | 12–25 m | mild |
| Oct | 27–29 °C | 8–15 m | moderate |
| Nov | 26–28 °C | 5–12 m | moderate |
| Dec | 25–27 °C | 8–15 m | moderate |
Season calendar
Peak season highlighted · current month outlined
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