Ha Long Bay is the number one tourist attraction drawing a steady stream of visitors year round in the North East region of Vietnam. Honorably recognized as a World Heritage Site by UNESCO in 1994, it is a priceless collection of spectacular islands, grottoes and caves.

Sung Sot cave:

Situated in the central zone of Ha Long Bay, Sung Sot cave is one of the largest and most beautiful caves here. It covers an area of 10 000 square meters at an altitude of 25m. Following the steep path under shady trees, visitors will reach the cave consisting of two chambers separated by the 3m-wide path. The outer chamber is square, the ceiling of which is filled with fabulous stalactites. Different from the outer chamber, the inner one is vast with capacity for thousands of people. It features formations shaped like fairy tales. For example, in the middle of the chamber stands a formation resembling a general surveying his troops. Sung Sot is the popular cave to visit.

Thien Cung cave:

Thien Cung is also one of caves that is worth a look in Ha Long Bay. It is located in Van Canh Island which is 4km from the wharf outside of Ha Long city. The way to the grotto is perilous, covered on both sides by thick forest. Though the entrance is quite narrow, the grotto gradually opens up when going further inside. With 130m in length, it is known as a magnificent palace filled with abundant stalagmites. In the center are 4 pillars fossilized many strange images from the base to the top including fish, birds, flowers, scenes of human life, singing and dancing fairies, etc. All were surprisingly formed by the hand of nature over million years.

Dau Go cave:

Of all caves in Ha Long Bay, Dau Go is probably the most famous one. Located on a limestone islet 8km south of Bai Chay, the grotto requires 90 hike-up steps to reach the entrance. Its present name is derived from the war against Mongolian aggressor in the 13^th century. The cave was used to store sharp wood stakes that the general Tran Hung Dao planted in the bed of Bach Dang River to form the barrier against the attacking Mongols. Dau Go cave is made of three chambers. The first one has the most spectacular stalagmites and stalactites of various shapes, depending on the imagination of observers. After passing the narrow passage naturally formed through erosion, the second chamber opens up in mysterious light. The walls here sparkle if bright light is shone on them. At the end of the grotto is a well filled with fresh water. In the grotto, there remains a stone stele carved King Khai Dinh's praise after his visiting to the cave in 1929 and being absorbed by the cave's beauty.