On the south-east side of Halong Bay, about 25 km from Bãi Cháy Wharf, Cống Ðỏ is in Bái Tử Long Bay in the region which recognised as the World Heritage. It has an area of 23,363 sq. m, and its mountain reaches a peak of 172 m. The island features many lagoons, which are the residence of numerous species of sea-life, such as shrimp, crab, fish, squid and aquatic plants. On the south-west side of the island, there is a wide coral reef displaying a myriad of colours.
Coral reef ecosystem is more than 700 m long and 300 m wide. It is preserved almost undamaged. In the future, there are plans for the development of a zone for scuba-diving. On the south-east side of the island, vestiges of the ancient commercial port of Vân Ðồn were discovered. This confirms beliefs that Cống Ðỏ Island once held an important position in terms of foreign trade.
Cong Do Island covers an area of 23.36 square kilometers. The island features with a 172-meter hill which is covered by an ever-green tropical forest. Moreover, the lagoons around Cong Do Island are also home to various species such as shrimp, crab, fish, squid and aquatic plants. Particularly, at the southwestern coast of the island, there is a pristine coral reef with the size of 700 meters long and 300 meters wide. The coral reef involves many rare species of coral (like red coral). This is also the habitation of seahorses and many kinds of fish. The coral reef is preserved in good condition.
Cong Do Island is the paradise of holiday. On the island, tourists can have trekking up to the hill and enjoy a panoramic view at the hilltop to charming scenery on Halong Bay. It’s also an ideal place for kayaking to discover the hidden lagoons on the island and its bio-diversity. Scuba-diving service is very potential to develop on Cong Do Island.
In the southeast of Cong Do Island, archaeologists found many trails of the ancient commercial port of Van Don. These evidences prove that Cong Do Island in the past had been a transit point of goods in the system of Van Don Commercial Port.