Sung Sot Cave: Inside the Surprise Cave of Ha Long Bay

Discovery, Name and Chambers

The French found Sung Sot Cave in 1901 and named it Grotte des Surprises. It lies on Bo Hon Island, 14 km from Bai Chay tourist wharf, with the entrance 25 m above sea level. Tourist access began in 1993, though the French had opened the cave to visitors in the early 20th century.

Sources disagree on the chamber count. Showcaves describes three chambers: the Waiting Room, a middle chamber with a prominent stalagmite and the Serene Castle. Other guides describe two main chambers, and the second can hold thousands of people. The passages are more than 10 m high and wide, the first chamber has a ceiling about 30 m high and the guided path runs about 800 m long. The total area is given as 10,000 square metres by Showcaves and 12,200 square metres by Sun Paradise Land.

Formations inside carry names such as The Head, The Fighting Cocks, The Fairy and The Buddha. Stone trails, railings and electric lighting, including coloured lights, run through the cave. In 2012 the Association of Czech Travel Agencies and Operators listed Sung Sot among the top 10 most beautiful caves in the world.

The Steps, the Path and the Crowds

You climb 50 steps from the pier to reach the entrance, then descend 10 steps into the cave. The cave sits about 20 m above sea level at the staircase point. Inside, the path is about 800 m long, on stone trails with railings, so it suits anyone comfortable with stairs and a steady walk.

A visit takes roughly 40 to 50 minutes, or 45 minutes to 1 hour by other counts. Crowds are the usual drawback. One guide gives the quietest windows as 8 to 9 in the morning or 4 to 5 in the afternoon. Listed hours vary by source, from 7:30 to 17:00 up to 8:00 to 18:00.

Route VHL2 and the Fee

Sung Sot Cave sits on route VHL2, one of the official Ha Long Bay sightseeing routes renamed under Resolution 51/2025/NQ-HDND. The route runs Soi Sim beach, Ti Top Island, Sung Sot Cave, Me Cung, Bo Nau, Luon, Trong, Trinh Nu and Ho Dong Tien caves, plus the Tung Sau lagoon pearl farming area. The VHL2 day ticket costs VND 250,000 per person, the same figure as routes VHL1 and VHL5, and it is a government fee separate from the cruise operator's price.

Guides say Sung Sot entry is part of that route ticket and is not usually sold separately for cruise guests, though some sources list a separate cave ticket. Day boats on the bay run from 5:00 to 20:00 during the summer season from 1 April to 31 October.

Which Cruises Stop at Sung Sot Cave

The day cruises below include a Sung Sot Cave stop. Prices are the card prices per person from the tour listings, and each row shows how that listing handles the Ha Long Bay entrance fee.

From Grotte des Surprises to Route VHL2

The French found the cave in 1901 and called it Grotte des Surprises. Sung Sot means surprise in Vietnamese, and the name refers to the jump from a narrow entrance to very large chambers inside. Tourist access began in 1993. In 2012 the Association of Czech Travel Agencies and Operators put Sung Sot on its list of the 10 most beautiful caves in the world.

Today the cave sits on Bo Hon Island, 14 km from the Bai Chay tourist wharf, with its entrance about 25 m above sea level. Entry is part of the route VHL2 ticket and is not usually sold on its own to cruise guests, which is why the day cruises here carry it inside their entrance fee line. A stairway leads up from the pier to the entrance, and the guides give different step counts, from 50 to about 100. TravelTriangle allows 45 minutes to 1 hour for the walk through, which matches the time most day cruises set aside before the boat moves on to the next stop.

The Formations Guides Point Out

Showcaves describes three chambers: the Waiting Room, a middle chamber with a prominent stalagmite, and the Serene Castle. Other guides count two main chambers and say the second can hold thousands of people. The first chamber has a ceiling about 30 m high and the guided path runs about 800 m on stone trails with railings and electric lighting, some of it coloured.

The guides name formations such as The Head, The Fighting Cocks, The Fairy and The Buddha. Size figures differ by source: Showcaves gives 200 m long, 80 m wide and 10,000 square metres, while Sun Paradise Land gives 12,200 square metres. Opening hours also differ, from 7:30 to 17:00 in one guide to 8:00 to 18:00 in another, so the cruise timetable decides when you go in. Oxalis suggests 8 to 9 in the morning or 4 to 5 in the afternoon to avoid the crowds.