The northern part of Côn Đảo Island is composed of quartz diorite and granite - granodiorite of late Mesozoic- early Cenozoic age, and is partially covered by Quaternary marine sediments.

On the western slope of Côn Đảo Island, there exist groups of outcrops of diorite and microgranite penetrated by big quartz bands.

[4] Three years later, on 2 March 1705, the Bugis mercenaries hired by the English mutinied, murdered the agents, destroyed the factory, and expelled the remaining settlers.

[7] In 2020, the United States Navy sent ships on "freedom of navigation exercises" around the islands to challenge what they deemed to be Vietnam's "excessive maritime claims.

The island's management is strongly geared towards sustainable use, hoping to learn from previous experiences in Vietnam and the region to balance development with conservation.

There is a daily overnight hour ferry service from Vũng Tàu which, in addition to bringing passengers, serves as the main source of importing goods to the islands.

The ferry operates on a daily basis, however in winter months the service depends largely on weather conditions as the seas between Côn Đảo and the mainland can be rough.

In 2016, a ferry service primarily for passengers opened up between Sóc Trăng and Côn Đảo, shortening the length of the journey to three hours.

She grieved their son and later committed suicide as she was touched by a butcher during a vegetarian festival seeing it as "harming her honour as a concubine".