Côn Đảo: Prison Islands Turned Eco-Sanctuary

Côn Đảo is an archipelago of 16 islands 230 km off the southern coast of Vietnam, administratively part of Bà Rịa-Vũng Tàu province. Until 1975 the main island, Côn Sơn, was a prison — French colonial from the 1860s, then American-backed South Vietnamese until reunification. Today it's the country's most remote and least developed tourist destination, with the cleanest beaches in Vietnam, year-round sea turtle nesting, and a single international-luxury resort.

What's distinctive

The prison history

Phú Hải Prison and the "Tiger Cages" at Trại Phú Tường are preserved as museums. The Tiger Cages are particularly disturbing — small open-roofed concrete cells where political prisoners (Communist Party members) were held in conditions that came close to torture by exposure. Lime was poured down on cell occupants by guards from above.

The cemetery at Hàng Dương holds many of those who died here, including the revolutionary heroine Võ Thị Sáu — executed by firing squad in 1952 at age 19. Her grave is a continual pilgrimage site, with offerings of sweets, cosmetics and lipstick.

This is the most important war-and-prison memorial in southern Vietnam outside HCMC. Two or three hours covers the essential sites.

The beaches

• Bãi Đầm Trầu: the famous one — white sand, calm water, sea turtle nesting in season.
• Bãi Lò Vôi: closer to town, easy swimming.
• Bãi Nhát: rocky and atmospheric.
• Bãi Ông Đụng: hike from the road to reach.

Visibility for snorkelling and diving is the best in Vietnam — Côn Đảo Marine National Park protects much of the surrounding reef.

Sea turtle nesting (May–October)

Green sea turtles nest on multiple beaches across the archipelago. The park runs a small turtle-conservation programme; visitors can join overnight monitoring trips with rangers on Hòn Bảy Cạnh island. Book through the park or your accommodation.

Diving

10–20 m visibility, healthy coral, occasional dugong sightings. Several dive shops operate (Côn Đảo Dive Center, others). Dives typically combine reef and wreck.

How to get there

Mode	Duration	Cost	Notes
Flight from HCMC (SGN)	50 min	~3–5M VND return	Vietnam Airlines and Bamboo, ATR turboprops. Multiple daily
Flight from Cần Thơ	45 min	similar	Less frequent
Ferry from Vũng Tàu	4 hr	~600k VND	When operating; often suspended in wet season
Ferry from Sóc Trăng	2.5 hr	~300k VND	Faster than Vũng Tàu when running

The flight is the standard. The airport on Côn Sơn island is small and right on the coast — the approach is one of the more dramatic in Vietnam.

When to visit

• March–September: dry season, calm seas, best diving. Turtle nesting peaks June–August.
• October–February: wet season — rougher seas, ferry suspensions, some dive operators close.

Where to stay

• Six Senses Côn Đảo: the famous luxury option. From $700/night. Beachfront villas, the only true international-luxury resort on the island.
• Côn Đảo Resort: mid-range, in town.
• Saigon Côn Đảo Resort: state-run, mid-range.
• Several small guesthouses and homestays in Côn Sơn town for budget.

Inventory is limited; book ahead, especially around Vietnamese long weekends.

Practicalities

• Cash: ATMs limited. Bring sufficient VND from HCMC.
• Motorbike rental is the standard local transport. ~150k VND/day.
• Marine park entry: small fee at the gate of National Park areas.
• Phone signal: good in Côn Sơn town, patchy elsewhere.

What it isn't

Côn Đảo is not a backpacker party island. It's not Bali or Phú Quốc. The atmosphere is reverent (because of the prison history), the beaches are beautiful but not lined with bars, and most visitors are Vietnamese pilgrims, Six Senses guests, or divers. That's what makes it special.

Who should come

• Anyone wanting Vietnam's cleanest beaches without the crowds
• Divers and snorkellers
• People interested in Vietnam War / colonial-prison history
• Travellers willing to pay more (flights and accommodation are pricier than mainland Vietnam)

Skip if you want lively nightlife, easy logistics, or a beach destination you can stretch a backpacker budget at.