What Dao Co To Con actually is
Dao Co To Con is the smaller sibling of Co To Lon, the main island in the Co To archipelago off the northeast coast of Quang Ninh province. Where Co To Lon has a town, motorbikes, and a growing number of guesthouses, Co To Con is almost entirely undeveloped — a rocky, forested island roughly 1.5 km long with a single lighthouse, a handful of caretakers, and no permanent tourist facilities.
The island sits about 6 km southeast of Co To Lon. For most of the year, hardly anyone visits. That's the draw. If you've been through Ha Long Bay on a cruise boat packed with day-trippers and want something quieter in the same province, this is the opposite end of the spectrum.
Why travelers go
People come here for one thing: the water. The sea around Co To Con is some of the clearest you'll find in northern Vietnam (베트남 / 越南 / ベトナム), especially from May to August. The coral areas off the island's southeast side are shallow enough to snorkel without a boat, and the rocky coastline creates natural pools at low tide.
There's also a simplicity to it. No restaurants, no WiFi signal to speak of, no one trying to sell you anything. You bring your own food and water, spend a few hours walking the trails and swimming, and then head back to Co To Lon before dark. It's a half-day trip that feels like a full reset.
Best time to visit
The window is narrow. June through August gives you the calmest seas and warmest water temperatures. July is peak — the water visibility is at its best and the boat crossing from Co To Lon is smooth.
Avoid November through March entirely. The northeast monsoon makes the crossing rough or impossible, and even reaching Co To Lon from the mainland becomes unreliable. April and May are transitional — you might get lucky with weather, but seas can still be choppy. September is hit-or-miss depending on typhoon season.
Photo by Tình Huỳnh on Pexels
How to get there
Getting to Co To Con requires two legs: mainland to Co To Lon, then Co To Lon to Co To Con.
Mainland to Co To Lon
From Hanoi, take a bus or drive to Van Don (about 200 km, roughly 4 hours by car). From Cai Rong port in Van Don, high-speed boats run to Co To Lon. The ride takes about 75 minutes and costs around 250,000–350,000 VND one way depending on the operator and seat class. There are usually 1–2 departures per day in summer, fewer in the off-season. Buy tickets in advance during weekends in July — they sell out.
An alternative slower ferry (about 3 hours) runs for around 130,000 VND but doesn't operate daily.
Co To Lon to Co To Con
From Co To Lon, you'll need to hire a small wooden boat from the main port area. The crossing takes about 20–30 minutes. Expect to pay 800,000–1,200,000 VND for a round trip for a group of up to 6–8 people. This isn't a scheduled service — you negotiate with boat owners directly, and they'll wait on the island and bring you back at an agreed time. Most people book 3–4 hours on the island, which is plenty.
Some guesthouses on Co To Lon can arrange the boat for you, which saves the haggling.
What to do on the island
Walk to the lighthouse
A dirt path climbs from the landing point to the Co To lighthouse on the island's high point. It takes about 20 minutes and the trail is straightforward. The lighthouse itself is a simple concrete tower, but the view from the top — open ocean in every direction, Co To Lon to the northwest — is worth the climb.
Snorkel the southeast shore
The rocky coast on the island's southeast side has the clearest water and the most interesting underwater terrain. Bring your own mask and snorkel — there's nowhere to rent gear on the island. The coral here is modest compared to central or southern Vietnam, but for the north, it's genuinely good. Watch for sea urchins on the rocks.
Swim in the natural rock pools
At low tide, several spots along the coast form shallow pools trapped between rock formations. These are calm, warm, and perfect for a long soak. Check tide tables before you go — your boat operator will know the timing.
Just sit
This sounds like filler advice, but it's not. Co To Con is one of the few places in northern Vietnam where you can sit on a rock for an hour and hear nothing but water and wind. No construction noise, no karaoke, no motorbike horns. If you've spent a week traveling through Hanoi, Ninh Binh, and Ha Long Bay (하롱베이 / 下龙湾 / ハロン湾), the silence here is genuinely restorative.
Where to eat
There are no restaurants or food stalls on Co To Con. Bring everything you need from Co To Lon.
On Co To Lon, eat seafood — that's the whole point. Grilled "sam" (horseshoe crab) is a local specialty, though it's an acquired taste and not available year-round. More reliably, look for grilled squid and steamed clams at the cluster of seafood restaurants near the port. A solid seafood meal for two runs about 300,000–500,000 VND. If you want something familiar, most places serve "pho" and rice dishes for around 40,000–60,000 VND.
Pick up bottled water, fruit, and "banh mi" from the small shops near the port before your boat to Co To Con.
Photo by Quang Nguyen Vinh on Pexels
Where to stay
You'll sleep on Co To Lon, not the small island. Accommodation ranges from basic homestays (200,000–400,000 VND/night) to newer mini-hotels with air conditioning and hot water (500,000–900,000 VND/night). There are no international-brand hotels. During July weekends, rooms fill up fast — book ahead or arrive on a weekday.
Camping on Co To Con is technically possible and some backpackers do it, but there are no facilities, no fresh water source, and you'll need permission from the island caretakers. It's not officially encouraged.
Practical tips locals would tell you
- Bring cash. There are a couple of ATMs on Co To Lon, but they run out of money on busy weekends. Load up in Van Don before the boat.
- Sunscreen and a hat are non-negotiable. There's almost no shade on Co To Con. The sun reflects hard off the rocks and water.
- Wear shoes you can get wet. The landing area is rocky and slippery. Flip-flops won't cut it — reef shoes or old sneakers are better.
- Charge your phone on Co To Lon. There's no power on the small island, and if you're taking photos all morning, your battery won't last.
- Bring a dry bag for your phone and wallet on the boat. The crossing can spray, especially if there's any wind.
Common mistakes to avoid
Showing up without checking the weather forecast. If seas are rough, boats to Co To Con simply don't go, and you'll have wasted the trip to Co To Lon. Monitor conditions a day or two ahead.
Trying to do Co To Con as a day trip from Hanoi (하노이 / 河内 / ハノイ). The logistics don't work — you need at least one night on Co To Lon, ideally two if you want a buffer day for weather.
Expecting a developed beach destination. There are no sun loungers, no cocktail bars, no organized tours on the island. If that's what you want, Phu Quoc or Da Nang will serve you better. Co To Con rewards people who are comfortable with a little roughness and a lot of quiet.
Last updated · May 22, 2026 · independently researched, never sponsored.
