Coastal Vietnam
A UNESCO karst labyrinth in the north, a reef-fringed bay at the centre and a turtle-nesting archipelago in the south — three cruising grounds along one coastline the charter world is only now starting to chart.
Coastal Vietnam is not one cruising ground but three, strung along some 3,260 kilometres of coastline that the charter world has barely begun to chart. In the north, Ha Long Bay and its quieter neighbour Lan Ha share a single UNESCO World Heritage listing — a karst labyrinth of well over a thousand limestone islands, extended in 2023 to fold in the whole Cat Ba Archipelago. Over five hundred nautical miles south, Nha Trang holds one of the finest natural bays in Asia, its reef among the most biodiverse waters in the country. Further south again, Con Dao trades scenery for something starker: a national park built around Vietnam's last known dugong population and its principal green-turtle nesting ground, anchored by a former penal colony now preserved as a heritage site. None of it runs on a charter licence the way Thailand or Indonesia now does — every visit here is agent-led, worked out mooring by mooring and permit by permit with someone who already holds the relationships.
“Ha Long Bay and Nha Trang sit over five hundred nautical miles apart — Coastal Vietnam is three grounds sharing a coastline, not one continuous run.”
Signature anchorages
Not one cruising ground but three, spread along a coastline still finding its charter footing — a UNESCO karst labyrinth in the north, a reef-fringed bay at the centre, and a turtle-nesting archipelago in the south.
- Lan Ha Bay & the Cat Ba ArchipelagoThe calmer, less-touristed half of the karst labyrinth south of Ha Long Bay proper — hundreds of limestone islets break the swell from almost every direction, kayak-only passages through the Dark and Bright Caves open onto hidden lagoons, and the Ba Trai Dao islets hold the clearest water and the smallest beaches within reach of Cat Ba.
- Ha Long Bay — Bo Hon Island & the grottoesThe bay's headline karst: Sung Sot (Surprise) Cave, its largest grotto at some 800 metres deep, sits on Bo Hon alongside Luon and Trinh Nu Caves. Busier with day-boat traffic than Lan Ha, but the towers themselves give good shelter from most directions.
- Cat Ba National Park & Viet Hai villageMuch of Cat Ba Island is protected rainforest, home to the Cat Ba langur, one of the rarest primates on Earth. Anchor off the north coast, in the lee of the island's own high ground, and tender in to Viet Hai, a farming hamlet reachable only by boat or a jungle trail.
- Nha Trang Bay — Hon MunVietnam's first marine protected area and, on the WWF's assessment, its richest reef. The channel between Hon Mun and Hon Tre gives reasonable shelter from the prevailing swell and the shortest tender run back to Ana Marina.
- Nha Trang Bay — Hon Tre's outer coastThe bay's largest island, Vinpearl's cable car running overhead. Anchor in the lee of the quieter southern shore, clear of the resort's own tender and ferry traffic, for a settled night within sight of the marina lights.
- Con Dao — Bay Canh IslandThe archipelago's principal green-turtle nesting beach and a dive site in its own right, with holding good enough for a settled-weather night. Landing after dark during nesting season needs a ranger permit, arranged through the national park office rather than on spot.
- Con Dao — Con Son Bay & Dam TrauThe archipelago's only real settlement and its only fixed pier. Con Son Bay takes the brunt of the winter northeast monsoon, so settled-weather anchoring shifts to the sheltered west and southwest coast between October and February.
The scene
Ha Long Bay – Cat Ba Archipelago
The 2023 extension folded the neighbouring Cat Ba Archipelago into the original 1994 listing; the joint site now runs to 1,133 islands and islets across 65,650 hectares — Vietnam's first World Heritage Site to span two provinces.
Hon Mun
Vietnam's first marine protected area, established in the waters off Nha Trang; some 350 species of hard coral recorded, assessed by the WWF as the richest stretch of reef in the country.
The green turtles of Bay Canh
Con Dao accounts for roughly nine in ten of Vietnam's green-turtle nesting, most of it across the fourteen beaches of Bay Canh Island. The park has assisted more than 21,000 nests since 1995, at a hatch rate above 80%.
Con Dao's last dugong
Around a dozen dugong still graze the park's collapsing seagrass beds — Vietnam's last known population. Sightings are rare and never guaranteed; the park itself was declared the country's first marine Ramsar site (a wetland recognised as being of international importance) in 2013.
Con Dao Prison
Founded by the French colonial government in 1862 and operated for 113 years, the prison is linked to an estimated 20,000 deaths across its history, including the notorious “tiger cages” built in 1940. It survives today as a preserved national heritage site.
Table & stay ashore
Six Senses Ninh Van Bay
Boat-access only, a twenty-minute tender run into a crescent bay backed by jungle-covered hills; sixty-two pool villas, and guided walks in search of the endangered black-shanked douc langur.
Six Senses Con Dao
Fifty pool villas and residences in reclaimed teak, built to resemble a fishing village on the edge of the national park; its turtle incubation centre has released more than 33,000 hatchlings since 2018.
Flamingo Cat Ba
One of northern Vietnam's largest five-star resorts, its rooms and villas stacked up the hillside above Cat Ba town with a clear run of Lan Ha Bay from almost every window.
Costa Seafood
A glass-fronted dining room on Tran Phu Beach built around the day's live catch — grilled lobster, seared scallops, steamed crab — with a wine list drawn from France, Chile and Australia.
All Seasons, Ana Marina
The marina's own dining room at the northern end of Nha Trang Bay, open-sided over the water — the easiest dinner in reach of a berth anywhere in the country.
A week, sketched
Tuan Chau to Bo Hon Island
Embark at Ha Long City and provision, then a short run into Ha Long Bay proper for Sung Sot Cave's 800-metre chamber and a first look at the karst towers before the day-boat traffic builds.
Ha Long Bay's outer towers
A slower day threading between the bay's limestone stacks, Trong Mai islet among them, with swim stops in the quieter channels away from the main tourist routes.
South to Lan Ha Bay
Round Cat Ba Island into Lan Ha's calmer half of the archipelago; kayak the tidal passage through the Dark and Bright Caves into the lagoon beyond, then anchor off the Ba Trai Dao islets.
Cat Ba National Park
Tender in to Viet Hai village, a farming hamlet reachable only by boat or jungle trail, for a walk through the rainforest that holds the last of the Cat Ba langur — sightings are rare, but the forest itself is reason enough.
Cai Beo & Lan Ha's hidden lagoons
Past Cai Beo, one of northern Vietnam's oldest and largest floating fishing villages, then an afternoon kayaking between karst towers into lagoons that open only at the right state of tide.
Ha Long Bay's southern reaches
A last full day back among the towers on Ha Long Bay's quieter southern side, away from the Bo Hon Island crowds, with time for a final swim before the light goes.
Return to Tuan Chau
A short run back to Ha Long City to disembark, with a last look at Trong Mai islet from the water on the way in.
Pair with
Plan this water
Coastal Vietnam
A UNESCO karst labyrinth in the north, a reef-fringed bay at the centre and a turtle-nesting archipelago in the south — three cruising grounds on one still-emerging coast, best worked through an agent who already holds the relationships.
The year, measured
Monthly means at the heart of this water — daily maxima averaged, wind as mean daily peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air, day °C | 19 | 20 | 24 | 26 | 29 | 31 | 31 | 30 | 30 | 27 | 25 | 20 |
| Sea °C | 18 | 18 | 23 | 26 | 29 | 32 | 33 | 32 | 31 | 29 | 26 | 21 |
| Wind, peak kt | 10 | 10 | 9 | 9 | 10 | 11 | 10 | 9 | 8 | 10 | 10 | 10 |
ERA5 reanalysis via Open-Meteo · 2019–2023 means · sea temperature 2022–2023
The yachts that run these waters
Profiles from the record — introductions via the harbour desk.
Read on: WAKE — the magazine · the guides · the glossary