Trinh Nu cave is located about 16 km from Tuan Chau international cruise port, about 13.5 km from Ha Long international passenger port to the southeast (opposite of Trong cave). The cave is located in the northeast of the Bo Hon island range, more than 3km from Sung Sot cave. To visit, visitors must buy sightseeing tickets and train tickets, then depart from one of the following two ports: Tuan Chau international tourist port or Ha Long international passenger port. Note that Trinh Nu cave and Trong cave are only located on sightseeing route 2.

During the French colonial period, when mapping, there were many islands and caves that the French put their way, but for Trinh Nu cave, they named it based on the legend of the fishermen, so the cave called La vierge (translated into Vietnamese as "The Girl's Cave").

The name of Trinh Nu cave begins from a story about the iron heart, the faithful love of a couple. The story goes that, in the past, on Ha Long Bay, there was a very beautiful girl from a fishing village, but her family was poor and had to work for landowners in the area. Seeing her beautiful beauty, the landlord forced her family to marry her as a concubine for him, but she did not agree because in her heart she already had someone she loved. Her lover was at that time going out to sea to catch and prepare for their wedding day. But unexpectedly, the landlord saw her unwilling, immediately pushed her to the deserted island, the girl was then starving, exhausted and petrified here. So when visitors enter Trinh Nu cave, right in the middle of the cave is a stone statue of a girl, lying with her long hair, eyes looking out to sea, waiting for her lover to return. Hearing the news of the girl's accident, the boy rushed to find her by boat, but that night a storm arose, causing his boat to break, he washed up on a deserted island. When he woke up, looked into the distance and recognized the girl he loved, he tried to call her but his calls were blown away by the wind. He used the rock to hit the cliff to tell her that he had come. He knocked until he was exhausted and here he was also petrified. The place where he petrified is called Trong cave (Con Trai cave) located about 700-800m from Trinh Nu cave on the opposite side. Although the love story is somewhat romantic, it makes many tourists excited and curious to once visit Trinh Nu cave and Trong cave or at least watch the cave when the train passes.

In 2000, archaeologists discovered in Trinh Nu cave archaeological relics, vestiges of prehistoric inhabitants of Ha Long Culture (about 4,000 years ago).

In 2010, archaeologists suddenly discovered that in front of Trinh Nu cave, there were many pieces of ceramics, pieces of dishes identified as belonging to the Tran dynasty, pieces of glazed pottery from the Le Dynasty, and a lot of ceramics. other ambassadors of many Chinese feudal dynasties. From the above relics, it is said that Trinh Nu cave was previously a relic of an ancient ceramic wharf belonging to the ancient Van Do trading port system, considering that the scale here is small and irregular.

When coming to Ha Long, you should not ignore the two names of Trinh Nu Cave and Trong Cave, which have become two familiar destinations for domestic and foreign tourists when visiting the bay in Ha Long.

Entrance ticket price:

Route 2: Cruise Port – Park of Caves: VND 290,000/person

Children under 1.2m or under 7 years old: Free

Elderly people who are Vietnamese citizens from 60 years of age or older (required to present ID card, CCCD or equivalent documents): 50% discount on ticket price

Train ticket price: 150,000 VND / 1 person