On the south-east side of Ha Long Bay, about 25 km from Bai Cháy Wharf, Cong Do is in Bái Tu Long Bay in the region which recognised as the World Heritage.

Situated in the North-East region of Vietnam, Halong Bay is a bay in the Gulf of Tonkin comprised of regions of Halong City, the township of Cam Pha, and a part of the island district of Van Don. Halong Bay borders Cat Ba Island in the southwest, the East Sea in the east, and the mainland, creating a 120 km coastline.

Ngoc Vong, or Gem Island, is a pretty site sitting between the Nét Islet and Phuong Hoàng (Phoenix) Island, in the Vân Don District. From above, Ngoc Vong looks like a beautiful velvet handkerchief with exquisite white edgings; it seems to float on the water surface. On the east side of the island there is a kilometres-beach with pure white sand. At the centre is a luxuriant benjamin fig tree; it was under this tree that Ho Chí Minh stood and conversed with the population in 1962 during a visit.

Quan Lan Island belongs to Bai Tu Long Bay, it has an area of 11km², and features eight populated hamlets. Quan Lan Island stretch toward East – West from the foot of Van Don Range to the Got Mount with many high mountains to the east barring waves and winds, protect the villages.

In the itinerary of Thien Cung – Dau Go – Ti Top, after visiting Thien Cung and Dau Go, one needs 10 minutes boating to the Cho Da Islet or Stone Dog Islet.

Soi Sim is an soil island 400 m away from Ti Top Island, and 7-8 km from the Bãi Cháy Tourist Wharf. In the island there are many ancient trees.

Ngoc Vong, or Gem Island, is a pretty site sitting between the Nét Islet and Phuong Hoàng (Phoenix) Island, in the Vân Don District. From above, Ngoc Vong looks like a beautiful velvet handkerchief with exquisite white edgings; it seems to float on the water surface. On the east side of the island there is a kilometres-beach with pure white sand. At the centre is a luxuriant benjamin fig tree; it was under this tree that Ho Chí Minh stood and conversed with the population in 1962 during a visit.