Is located in Baitulong Bay, 25km away from Campha Town to the southeast. In the 12th century, the island used to be a busy and important center for trade between Vietnam and foreign fleets. Although it is far from the mainland, there is a whole complex of valuable historical vestiges and relics found here, such as: ancient communal houses, pagodas, shrines and trade ports. Particularly, the local community has retained and developed the traditional customs and typical festivals of the northern fishing villages.
Visiting the island, visitors can enjoy the local seafood and beaches of white sand, which is also used to make glass.
This is a land Island covering 12sq.km. and 34km. away from Baichay Tourist Wharf. It has been inhabited for a long time. Surrounding the island are many beautiful, sandy beaches. On the island is Vanxuan Mountain, 182m high. There is also an ancient village from the time of Halong Culture, which covered an area of 4,500sq.m. This was Congyen Old Port, in the trading area of Vandon in the 11th century. There are also the remains of old ramparts from the Tran and Nguyen Dynasties (17th – 18th century.) 
Situated on Daube Island, 25km. away from Baichay Tourist Wharf in the southwest, the lake is famous for its attractive scenery. There are actually three lakes connected together. Tourists visit these lakes by bamboo boats through low vault like passages with stalactites hanging down. They can observe a diversity of flora and fauna. On the cliff at the entrance, tourists can observe some species of orchid. To paddle by bamboo boats to Baham Lakes takes about 45 minutes. Canoes can be hired (life jackets must be worn.)
Situated to the northwest of Trai Cave, it is 4 –5m above sea level. The entrance is 40m – 50m wide and 10m high. The floor covers 1,000sq. meters strewn with ancient freshwater shells - evidence of prehistoric habitation. Here are the thickest deposits of fresh water shells yet found in Vietnam from pre-historic times. The volume of shells runs to hundreds of cubic meters.
Situated on Lombo Island, it is 2km away from Sungsot Cave. Access to the entrance of the grotto is on the Catba – Haiphong sea passage. The exit leads to a ‘garden’ area outside the grotto. Mecung is one of grottoes containing archaeological remains of Halong Culture dating from 20,000 years ago. In the entrance, visitors can see, to a thickness of 2 –3 m, cultural deposits of ancient freshwater shells – evidence of the pre-historic people who used to live in the grotto.
Located to the northeast of Bohon Island, it leads to a calm, blue, closed lake which only opens to the sea via a vault like stone passage, 60 meters long but only 2.5m to 4m high, depending on the level of the tide. It takes 20 minutes to paddle inside by bamboo boats.
These two caves are located on two sides of an arc of small islets, to the east of Bohon Island and are 700m apart through a small sea valley. The entrances of the caves face in opposite directions. Sounds reverberate from one to the other. Stalactites in the caves are strange and attractive and resemble different shapes.