Hon Co Island – the green island of Bai Tu Long Bay
Hon Co Island sits in the Cong Do area of Bai Tu Long Bay, the quieter stretch of water northeast of the busy central Halong Bay. It lies within a protected nature reserve, surrounded by clear water and scattered islets, well away from the main tourist routes. It is a small island, and on its own a fairly modest one, but its setting and its cave have made it a worthwhile stop on cruises through this calmer part of the bay.
The island and its name
The name Hon Co means “Grass Island,” and it fits: green grass and vegetation cloak the limestone from the waterline right up to the peak, giving the island a lush, emerald look against the white rock. At its foot is a small white-sand beach with calm, clear water. The island is uninhabited and undeveloped, with no towns or buildings, just nature, which is a large part of its quiet appeal.
A quiet, lesser-known island
Compared with the famous islands of central Halong Bay, Hon Co Island is not a name most first-time visitors know. It stayed largely off the tourist map until Thien Canh Son Cave opened to visitors, which is what really put it on cruise itineraries. As a result, it remains far quieter and more unspoiled than the busy heart of the bay, and that peaceful, pristine character is its main draw rather than any single dramatic sight.
What’s on Hon Co Island: the cave, beach, and bay
Hon Co Island’s appeal really comes down to three things: the cave, the small beach, and the quiet water around it. None of them is enormous on its own, but together they make a pleasant, varied stop on a cruise through Bai Tu Long Bay. Here is what you will find.
Thien Canh Son Cave
The main reason to stop at Hon Co Island is Thien Canh Son Cave, the principal cave of Bai Tu Long Bay. A climb of around 100 steps up the island’s slope leads to spacious, well-lit chambers of stalactites, and from near the entrance there is a sweeping view over the bay. It is the headline sight here, and for most people it is what the visit is built around.
The beach and swimming
At the foot of the cave is a small white-sand beach, a lovely spot for a swim in the calm, clear water after the climb. It is modest in size, but the sheltered setting and the quiet make it a relaxing place to cool off, and some cruises let you jump straight from the boat into the sea here.
Kayaking around the island
The calm, sheltered water around Hon Co Island is also good for kayaking, a peaceful way to explore the Cong Do area and get close to the cliffs and islets. If paddling appeals, it is worth knowing how it generally works in the area, which we cover in our guide to kayaking in Halong Bay.
Because cruises through Bai Tu Long Bay are often overnight, a stop at Hon Co Island may also tie into a quiet evening on the water, with sunset, a calm night at anchor, and sunrise the next morning, part of what makes this quieter route appealing.
How to visit Hon Co Island
Hon Co Island is reached only by boat, and specifically as part of a Bai Tu Long Bay cruise rather than the standard central Halong Bay day routes. Because it sits in the quieter Cong Do area, away from the main tourist circuit, you need a cruise that heads into Bai Tu Long Bay and lists this stop. Most of these are overnight cruises rather than quick day trips.
The number of operators running this route is smaller than for central Halong, so it pays to check the itinerary carefully before booking. One thing to watch is that the stop is sometimes listed under the cave’s name, Thien Canh Son, rather than Hon Co Island, so do not be put off if you do not see “Hon Co” spelled out, they are the same place.
When it comes to the visit itself, the cruise anchors offshore and a smaller tender boat takes you across to the island for the cave, the beach, and any kayaking. As with the rest of the bay, you move between the boat and the island by tender rather than docking directly.
Practical tips and visiting information
A few practical things to keep in mind, with the full cave detail covered in its own guide:
- There is no accommodation or real infrastructure on Hon Co Island, as it sits in a protected reserve, so everything you need comes from your cruise.
- There is a climb of around 100 steps up to Thien Canh Son Cave, so wear comfortable shoes with good grip, as the steps can be slippery when wet.
- Bring a swimsuit and your own towel for the beach, along with sun protection and water for the climb.
- The best time to visit mirrors the bay generally: roughly autumn to spring brings the clearest, driest weather, while summer is hot with a higher chance of storms. The in-bay water stays calm for most of the year.
- It is much quieter than central Halong Bay, but it can still get busy when several Bai Tu Long cruises arrive together.
- It is a protected area, so do not litter or disturb the vegetation and wildlife.
Is Hon Co Island worth adding to your cruise itinerary?
If you have spotted Hon Co Island on your cruise itinerary and are wondering whether it matters, the honest answer is that the island itself is modest, but the stop is a genuinely pleasant one. Its real value is the package it offers: Thien Canh Son Cave, a small beach for a swim, a view over the bay, and a quiet, unspoiled setting. Taken together, on a Bai Tu Long Bay cruise, that makes it a worthwhile and relaxing highlight rather than a sight you need to seek out for its own sake.
It is worth being clear about what it is and is not, though. Hon Co Island is not a reason in itself to choose one cruise over another, it is more a nice bonus of picking the quieter Bai Tu Long route. If you are on a standard central Halong Bay cruise, you will not pass Hon Co at all, and you are not missing a headline sight, just a calmer, greener corner of the bay.
So the bigger decision is really whether to choose a Bai Tu Long Bay cruise in the first place. If you do, Hon Co Island is a lovely stop to look forward to: peaceful, scenic, and a good deal less crowded than the famous islands further west. If you would rather see the bay’s most famous caves and viewpoints, a central route is the better fit, and Hon Co simply will not feature. For how its cave compares with the rest and which are worth prioritising, see our overview of the caves in Halong Bay.
