Sung Sot Cave is inside Bo Hon Island, near the middle of Ha Long Bay. You can only reach it by boat. The Ha Long Bay Management Board lists it on sightseeing route VHL2, together with Ti Top Island, Hang Luon and a handful of smaller caves.
The name means "surprise". Vietnamese Wikipedia says a French visitor in 1901 called it "Grotte de la surprise", and explains the name by the narrow entrance that opens into a much bigger hall. The board groups Sung Sot with Thien Cung and Dau Go as old underground caves: large, with plenty of stalactites.
Inside, a paved stone path leads you through the chambers. The way up to the entrance is a flight of stone steps under the trees on the island's slope.
Getting there
Every visit starts at a cruise port on the mainland. The board says the two common day routes leave from Ha Long International Cruise Port or from Tuan Chau International Port, and it sells tickets at counters in both. Route VHL2, the one that stops at Sung Sot, takes about 6 hours.
Measured in a straight line on map coordinates, the cave is about 12.7 km from Ha Long International Cruise Port; the boat route is longer. The board puts the road trip from Hanoi at about 1 hour 30 minutes on the Hanoi to Hai Phong expressway, and about 2 hours from Noi Bai airport. From Van Don airport it is about 45 minutes.
Hours and fees
| Season | Hours at the cave |
|---|---|
| Summer, 16 April to 31 October | 7:30 AM to 5:30 PM |
| Winter, 1 November to 15 April | 7:30 AM to 5:00 PM |
Boats leave port from 5:00 AM and must be back by 8:00 PM between 1 April and 31 October. Between 1 November and 31 March they leave from 5:30 AM and return by 7:00 PM.
You don't buy a ticket for the cave alone. The fee is for the whole route:
| Ticket, route VHL2 | Price |
|---|---|
| Adult, any nationality | VND 250,000 |
| Child aged 7 to under 16, any nationality (20% off) | VND 200,000 |
| Child under 7, or under 1.2 m tall | Free |
VND 200,000 is our arithmetic: the board's VND 250,000 less its 20% child discount. A foreign child aged 7 to 15 needs a passport to get the discount. Keep your ticket for the whole trip, because staff check it at each stop.
Nearby
- Ti Top Island: about 2 km in a straight line, and on the same VHL2 route.
- Thien Cung Cave: about 10.8 km in a straight line, on route VHL1, a separate ticket.
Questions travelers ask
Can I fit a Ha Long Bay day cruise into a short layover in Hanoi? A traveler with about a day between flights asked this on r/VietNam. One reply said a chartered boat is the only flexible option:
"It's only doable if you charter a boat - you can start and end whenever you like (but not after dark - needs special permit to stay in the water after sundown)."
u/MemoryLatter761 on r/VietNam
Another warned about the time lost at the pier:
"Traffic is one thing but even the boarding and off-boarding of these cruises is a chaos fest. Lots of sitting around with huge groups of people just waiting to be called."
u/MouseHouse444 on r/VietNam
