Hon Mun Island Nha Trang 2026: Reef Status & Boat Trips

Hon Mun Island (Hòn Mun, “Ebony Island”) is a small rocky island in Nha Trang Bay, about 10 km by boat from Cau Da Port. It lies at the heart of Vietnam’s first marine protected area and is famous for its coral reefs and dark cliffs. Since June 2022 swimming and diving in its strictly protected zone have been suspended, so most visitors see it on a bay boat trip.

Status (checked October 2026): swimming, snorkelling and scuba diving inside the strictly protected Hon Mun zone remain suspended (in place since 27 June 2022 to let the reefs recover; still in force in a May 2026 government report). Boat trips still pass the island, and licensed dive centres take guests to other permitted reef sites in Nha Trang Bay. Avoid tours that promise to “snorkel at Hon Mun” without naming the actual site.

Why Hon Mun Island is worth seeing:

Vietnam’s marine conservation flagship: the reefs around Hon Mun were the core of the country’s first pilot marine protected area in the early 2000s.
Dramatic dark cliffs: the black-brown rock that gives the island its “ebony” name drops straight into clear blue water.
A reef that is coming back: surveys report live coral cover of about 65–80% on parts of the reef after the tourism pause.
An easy half-day on the water: the island sits on the classic Nha Trang Bay boat route, together with Hon Tam and Hon Mieu.
A story worth knowing: Hon Mun shows how Nha Trang is trying to balance mass tourism with protecting its sea.

Hon Mun Island at a Glance

Vietnamese name	Hòn Mun (“mun” means ebony)
Location	South-eastern Nha Trang Bay, off Nha Trang ward, Khanh Hoa province (Khanh Hoa and Ninh Thuan merged into one province on 1 July 2025)
Distance	About 10 km by sea from Cau Da Port; roughly 30–45 minutes by tour boat, 15–20 minutes by speedboat
Known for	Coral reefs, reef fish, dark cliffs, Nha Trang Bay Marine Protected Area
Recognition	Strictly protected sub-zone of the Nha Trang Bay Marine Protected Area (formerly the Hon Mun MPA)
Current access	Viewing from boats; swimming and diving in the strict zone suspended since June 2022
Cost	No separate island ticket; you pay for the boat or bay tour (price varies by operator and inclusions)
Time needed	Half day (as part of a Nha Trang Bay boat trip) or a full-day island tour
Best time	February to August for calm, clear sea; mornings for the best visibility
Nearby	Hon Tam, Hon Mieu (Tri Nguyen Aquarium), Vinpearl / VinWonders on Hon Tre, Cau Da Port
Find it	Google Maps · Tripadvisor

Is Hon Mun Island Worth Visiting?

Yes, as part of a Nha Trang Bay boat trip, but not as a snorkelling destination right now. The island is beautiful from the water and important to understand, yet the reef itself is closed to swimmers and divers while it recovers. If underwater time is your priority, book a licensed dive centre and ask which permitted site it uses that day.

Best for: travellers on a bay cruise, photographers, people interested in marine conservation, families combining several islands in one day.
Skip if: you only want to snorkel on Hon Mun’s own reef; that is not allowed at present.
Short on time: choose a half-day bay trip from Cau Da Port that passes Hon Mun and stops at a beach island such as Hon Tam.

History of Hon Mun and the Marine Protected Area

Where the name comes from

“Mun” is the Vietnamese word for ebony. The island’s cliffs are made of dark, almost black rock, which sailors and fishermen compared with ebony wood, and the name stuck. Seen from a boat in the morning light, the cliffs contrast sharply with the turquoise water around them.

Vietnam’s first marine protected area

Scientists identified the reefs around Hon Mun as some of the richest in Vietnam in the 1990s. In the early 2000s a pilot project supported by international partners turned the waters around Hon Mun and its neighbouring islands into Vietnam’s first marine protected area, with zoning, patrols and rules for fishing and tourism. Today it is managed as the Nha Trang Bay Marine Protected Area, which also covers islands such as Hon Tre, Hon Mieu, Hon Tam, Hon Mot, Hon Cau and Hon Vung.

Why swimming and diving were suspended

By the late 2010s heavy tourist traffic, anchoring, illegal fishing and coastal pollution had damaged parts of the reef, and Typhoon Rai in December 2021 destroyed much of the shallow coral on the south-west side. On 27 June 2022 the authorities suspended swimming, diving and glass-bottom boat activity in the strictly protected Hon Mun zone. Later surveys reported live coral cover of about 65.5% on the northern reef and around 70–80% on the southern reef, and a 2026 report from the Ministry of Agriculture and Environment described the recovery as clear, with the suspension still in place.

Lionfish on a coral reef in Nha Trang Bay — The protected reefs around Hon Mun are rich in coral and fish. Photo: Ilse Reijs and Jan-Noud Hutten, CC BY 2.0, via Wikimedia Commons.

What to See at Hon Mun Island

1. The ebony cliffs

The island’s steep dark cliffs are its signature view. Boats usually slow down along the shore, giving you time to photograph the rock walls, sea caves and the contrast with the bright water.

2. Clear water over the reef

On calm days you can see the colour of the shallow reef from the boat. The best visibility usually comes from about March to August, especially in the morning before the wind picks up.

3. Marine life from above

Groupers, parrotfish, sea cucumbers, giant clams and abalone are among the species recorded at high density since the tourism pause. You will not see most of them from a boat, but the bay’s wider reef life is on show at the National Oceanographic Museum near Cau Da Port.

4. The Nha Trang Bay panorama

From the waters off Hon Mun you look back across the bay to the mountains behind Nha Trang, Hon Tre island with the VinWonders Nha Trang complex, and the smaller islands of Hon Tam and Hon Mot.

5. Permitted dive sites elsewhere in the bay

Licensed dive centres continue to run try-dives and certified dives at other approved sites in Nha Trang Bay. In 2024 Khanh Hoa designated trial dive areas such as the north of Hon Rua, the artificial reefs off Vinh Hoa and the north-east of Tri Nguyen island; the list can change, so let your operator confirm the site.

Hon Mun Access, Costs and Rules (2026)

Item	Details
Island ticket	None; there are no visitor facilities or landing on Hon Mun
Swimming and snorkelling in the strict zone	Suspended since 27 June 2022 (still in force in 2026)
Scuba diving in the strict zone	Suspended; licensed centres dive at other permitted sites
Bay boat trips	Run daily in good weather from Cau Da Port; cost depends on boat type, group size and inclusions
Typical tour hours	Departures around 8:00–9:00, back mid-afternoon
Weather closures	Boats may be cancelled when the port authority bans sailing in storms or strong winds

Rules for the protected area are set by the Nha Trang Bay Management Board under Khanh Hoa Province; reputable operators follow them and will explain the current permitted sites.

Rules and Etiquette in the Marine Protected Area

Do not swim, snorkel or dive in the Hon Mun strict zone while the suspension is in place.
Never touch, stand on or collect coral, shells, starfish or sea urchins anywhere in the bay.
Use reef-safe sunscreen or a rash vest, and do not feed fish.
Keep all rubbish on the boat; plastic is a major problem in the bay.
Book only licensed boats with life jackets for every passenger.

How to Get to Hon Mun Island

From	How	Time
Nha Trang beach hotels	Taxi or Grab to Cau Da Port, then a tour boat	About 15 minutes by car + 30–45 minutes by boat
Cau Da Port	Island-hopping tour boat or private speedboat	30–45 minutes (tour boat); 15–20 minutes (speedboat)
Cam Ranh Airport	Car to Nha Trang, then boat	About 45–60 minutes by car + boat
Dive centres	Hotel pick-up and dive boat to a permitted site	Usually a full morning

For taxis, buses and airport transfers, see our Nha Trang transport guide.

Best Time to Visit Hon Mun Island

When	What to expect
February – April	Calm sea, pleasant temperatures, good visibility; a very good time for boat trips
May – August	Hot and sunny, usually the clearest water of the year; book morning trips
September – December	Rainy season with storms and the strongest winds in October–November; frequent boat cancellations
January	Drying out but often windy, with choppy water
Time of day	Morning (8:00–11:00) for calmer water and better light

Local Expert Tips for Hon Mun Island

These tips come from years of arranging Nha Trang tours for international travellers.

Ask any “Hon Mun snorkelling” tour exactly where you will swim; honest operators name the permitted site.
Choose a smaller boat or private tour for a quieter day and more flexible timing.
Take motion-sickness tablets if you are sensitive; the open water near Hon Mun can be choppy.
Bring a dry bag for phones and cameras; spray is common on speedboats.
Combine the boat trip with the oceanographic museum at Cau Da to understand what lives on the reef.
Read our Nha Trang travel tips for scams to avoid and how to book boats.

Hon Mun Island vs Hon Tam Island

Feature	Hon Mun	Hon Tam
Main appeal	Protected reef, dark cliffs, conservation story	Beach resort, swimming, mud bath
Swimming	Suspended in the strict zone	Allowed at the resort beach
Facilities	None on the island	Restaurant, loungers, showers
Ticket	No island ticket; boat cost only	Resort ticket including boat transfer
Best for	Sightseeing from a boat	A relaxed beach day

Our view: see Hon Mun from the water on a bay trip and spend your swimming time at Hon Tam Island or on a permitted dive with a licensed centre.

Nearby Attractions

Hon Tam Island: beach resort and mud bath, about 15 minutes by boat.
VinWonders Nha Trang: theme park and aquarium on Hon Tre.
Vinpearl Harbour: the mainland gateway to Hon Tre, with shops and evening shows.
National Oceanographic Museum: marine life displays beside Cau Da Port.
Monkey Island (Hon Lao): monkeys and shows in Nha Phu Lagoon.
Hon Noi Island: the double beach on the swiftlet island north of the bay.

Sightseeing in Nha Trang for First-Time Visitors: Where Hon Mun Fits

Spend one morning on the bay (Hon Mun from the boat, a swim at Hon Tam), then use the afternoon for the Po Nagar Cham Towers and Long Son Pagoda. A second day can cover Monkey Island or the white sand of Doc Let Beach. For seafood after a day at sea, see our Nha Trang food guide, and choose a base with where to stay in Nha Trang.

Plan your trip with our Nha Trang travel guide and Nha Trang tours. Contact Vietnam Tour Expert Team for a free custom itinerary.

Frequently Asked Questions about Hon Mun Island

1. Where is Hon Mun Island?

Hon Mun is in the south-east of Nha Trang Bay, Khanh Hoa province, about 10 km by sea from Cau Da Port in Nha Trang.

2. Can you snorkel at Hon Mun Island in 2026?

No. Swimming and snorkelling in the strictly protected Hon Mun zone have been suspended since June 2022, and the suspension was still in force in 2026.

3. Can you scuba dive at Hon Mun?

Not inside the strict zone at present. Licensed dive centres in Nha Trang take divers to other permitted reef sites in the bay.

4. Why was swimming at Hon Mun suspended?

To let the coral recover from tourism pressure, illegal fishing, pollution and storm damage, including Typhoon Rai in December 2021.

5. What does the name Hon Mun mean?

“Mun” means ebony in Vietnamese; the island is named after its dark, almost black cliffs.

6. Is Hon Mun a marine protected area?

Yes. Hon Mun is the strictly protected core of the Nha Trang Bay Marine Protected Area, which began as Vietnam’s first pilot marine protected area in the early 2000s.

7. How do I get to Hon Mun Island?

Take a taxi to Cau Da Port and join a bay boat tour or hire a speedboat; the crossing takes about 30–45 minutes by tour boat.

8. Is there an entrance fee for Hon Mun?

There is no ticket for Hon Mun itself; you pay only for the boat or tour, and prices vary by operator.

9. Can you land on Hon Mun Island?

No, Hon Mun has no pier or visitor facilities; you see it from the boat.

10. What is the best time to visit Hon Mun?

February to August, ideally in the morning, when the sea around Hon Mun is calmest and clearest.

11. Is the coral at Hon Mun recovering?

Yes. Surveys found about 65.5% live coral cover on the northern Hon Mun reef and 70–80% on the southern reef, and a 2026 ministry report described the recovery as clear.