The Côn Đảo ("Côn Island") are an
archipelago
An archipelago ( ), sometimes called an island group or island chain, is a chain, cluster, or collection of islands. An archipelago may be in an ocean, a sea, or a smaller body of water. Example archipelagos include the Aegean Islands (the o ...
of
Bà Rịa–Vũng Tàu province
Bà Rịa–Vũng Tàu (abbreviated BRVT) was formerly a province of Vietnam. It was located on the coast of the country's Southeast region. It bordered Đồng Nai to the north, Bình Thuận to the northeast and Ho Chi Minh City metropolit ...
, in the
Southeast region of
Vietnam
Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...
, and also a district () of this province.
Geography
Situated about from
Vũng Tàu and from
Ho Chi Minh City
Ho Chi Minh City (HCMC) ('','' TP.HCM; ), commonly known as Saigon (; ), is the most populous city in Vietnam with a population of around 14 million in 2025.
The city's geography is defined by rivers and canals, of which the largest is Saigo ...
, the group includes 16 mountainous islands and islets. The total land area reaches and the local population is about 5,000.

The islands are composed of
magma
Magma () is the molten or semi-molten natural material from which all igneous rocks are formed. Magma (sometimes colloquially but incorrectly referred to as ''lava'') is found beneath the surface of the Earth, and evidence of magmatism has also ...
tic rocks of different ages. Hòn Bảy Cạnh, Hòn Cau and Hòn Bông Lang are composed of
Cretaceous
The Cretaceous ( ) is a geological period that lasted from about 143.1 to 66 mya (unit), million years ago (Mya). It is the third and final period of the Mesozoic Era (geology), Era, as well as the longest. At around 77.1 million years, it is the ...
microgranite rocks]. The northern part of Côn Đảo Island is composed of
quartz diorite and
granite
Granite ( ) is a coarse-grained (phanerite, phaneritic) intrusive rock, intrusive igneous rock composed mostly of quartz, alkali feldspar, and plagioclase. It forms from magma with a high content of silica and alkali metal oxides that slowly coo ...
-
granodiorite of late
Mesozoic
The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Period (geology), Periods. It is characterized by the dominance of archosaurian r ...
- early
Cenozoic age, and is partially covered by
Quaternary
The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the current and most recent of the twelve periods of the ...
marine sediments. The southern part of this island and Hòn Bà island are composed of the rhyolite and intrusive formations of unknown age. On the western slope of Côn Đảo Island, there exist groups of outcrops of diorite and microgranite penetrated by big quartz bands.
The island group is served by
Con Dao Airport situated on the largest island in the archipelago,
Côn Sơn Island. The total size of Côn Đảo Airport is , with one runway long. It can handle 400,000 passengers per year. Currently,
Vietnam Airlines (Operated by
VASCO),
Bamboo Airways and
Vietnam Helicopters are three airlines operating flights to the island.
History
In , the
Java
Java is one of the Greater Sunda Islands in Indonesia. It is bordered by the Indian Ocean to the south and the Java Sea (a part of Pacific Ocean) to the north. With a population of 156.9 million people (including Madura) in mid 2024, proje ...
(Daba) fleets from
Shailendra dynasty were laid a military attacks. The Cambodian inscriptions were generally said the fleets was ''Malayan'', ''Sumatran'', ''Javanese'', or all of them, quickly seized the island of Pulo-Condor (
Côn Sơn Island). At that time, the island were used by Javanese pirates to conducting some numerous military raids on
Champa
Champa (Cham language, Cham: ꨌꩌꨛꨩ, چمڤا; ; 占城 or 占婆) was a collection of independent Chams, Cham Polity, polities that extended across the coast of what is present-day Central Vietnam, central and southern Vietnam from ...
and Chiaou-Chou.
On June 16, 1702, the
East India Company
The East India Company (EIC) was an English, and later British, joint-stock company that was founded in 1600 and dissolved in 1874. It was formed to Indian Ocean trade, trade in the Indian Ocean region, initially with the East Indies (South A ...
from
England
England is a Countries of the United Kingdom, country that is part of the United Kingdom. It is located on the island of Great Britain, of which it covers about 62%, and List of islands of England, more than 100 smaller adjacent islands. It ...
founded a settlement on
Côn Sơn Island, which they named Pulo Condore as an ''
entrepôt'' for ships plying between India and China. 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.
During the internecine wars for the
Court of Huế, the
Nguyễn prince,
Gia Long
Gia Long (Chữ Hán, Chữ hán: 嘉隆) ( (''Hanoi, North''), (''Ho Chi Minh City, South''); 8 February 1762 – 3 February 1820), born Nguyễn Phúc Ánh (阮福暎) or Nguyễn Ánh (阮暎), was the founding emperor of the Nguyễn dynas ...
, born Nguyễn Phúc Ánh,
ceded the islands to France as part of the 1787
Treaty of Versailles
The Treaty of Versailles was a peace treaty signed on 28 June 1919. As the most important treaty of World War I, it ended the state of war between Germany and most of the Allies of World War I, Allied Powers. It was signed in the Palace ...
in return for military assistance. The treaty however was abrogated as France failed to provide the aid.
It was only under conquest that the islands came under French control in 1861.
Côn Sơn Island became infamous during the
French colonial era because of
Côn Đảo Prison and the notorious "
tiger cages". Vietnamese and Cambodian nationalists and revolutionaries were sent here to serve their sentence for anti-French activities. Many
Vietnamese Communist leaders were "schooled" on Côn Đảo Island as well.
The French Indochinese government named the group of islands Poulo-Condore Islands, a name that derives from the islands'
Malay name Pulo Condore (''pulau'' meaning "island" and ''kundur'' meaning "wax gourd"). The islands can be identified with
Ptolemy
Claudius Ptolemy (; , ; ; – 160s/170s AD) was a Greco-Roman mathematician, astronomer, astrologer, geographer, and music theorist who wrote about a dozen scientific treatises, three of which were important to later Byzantine science, Byzant ...
's ''Satyrorum insulae'' (Isles of the Satyrs), a name probably drawn from the monkeys endemic to the islands, the
Con Song long-tailed macaque, (''Macaca fascicularis ssp. condorensis''). Ptolemy refers to the three islands inhabited by people, 'said to have tails such as they depict satyrs having'.
In 2020, the
United States Navy
The United States Navy (USN) is the naval warfare, maritime military branch, service branch of the United States Department of Defense. It is the world's most powerful navy with the largest Displacement (ship), displacement, at 4.5 millio ...
sent ships on "
freedom of navigation exercises" around the islands to challenge what they deemed to be Vietnam's "excessive maritime claims."
Climate
Côn Đảo National Park
Many of the islands were given protected status in 1984 as part of
Côn Đảo National Park. This natural preserve was subsequently enlarged in 1998. Endangered species protected within the park include the
hawksbill sea turtle, the
green sea turtle, dolphins, and the
dugong.
Ecosystem
An ecosystem (or ecological system) is a system formed by Organism, organisms in interaction with their Biophysical environment, environment. The Biotic material, biotic and abiotic components are linked together through nutrient cycles and en ...
s represented in the park include
seagrass meadow
A seagrass meadow or seagrass bed is an underwater ecosystem formed by seagrasses. Seagrasses are marine (saltwater) plants found in shallow coastal waters and in the brackish waters of estuaries. Seagrasses are flowering plants with stems and ...
,
mangrove and
coral reef
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in group ...
s.
Côn Đảo National Park is working with the
World Wide Fund for Nature, formerly the World Wildlife Fund, (WWF) Vietnam to further protection in the marine areas, with programs to establish a
marine protected area that protects coral reefs, seagrass beds and species, while also developing sustainable nature-based
ecotourism
Ecotourism is a form of nature-oriented tourism intended to contribute to the Ecological conservation, conservation of the natural environment, generally defined as being minimally impactful, and including providing both contributions to conserv ...
. 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.
Ferry
A
hydrofoil service from Vũng Tàu to Côn Đảo was started in February 2019. The service is a daily return and boasts that the ferry will operate year-round, regardless of the weather. Travel time is 4–5 hours.
Two ferries operate between Côn Đảo and the mainland. 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. With the addition of a fast ferry to the islands, the islands have experienced an increase in tourism fueled mostly by domestic tourists who view Côn Đảo as a sacred place due to its history.
List of islands
Côn Đảo Islands include 16 islands, with a total area of
* Côn Lôn Island or
Côn Sơn Island (French: Grande-Condore), Phú Hải,
* Little Côn Lôn Island (Petite-Condore), or Hòn Bà, Phú Sơn,
* Bảy Cạnh Island, or Bãi Cạnh Island, Phú Hòa,
* Cau Island, or Phú Lệ
* Bông Lan Island, or Bông Lang, Bông Lau, Phú Phong,
* Vung Island, or Phú Vinh,
* Ngọc Island, or Trọc Island, hòn Trai, Phú Nghĩa,
* Trứng Island, or Đá Bạc Island, Đá Trắng Island, Phú Thọ,
* Tài Lớn Island, or Phú Bình
* Tài Nhỏ Island, or Thỏ Island, Phú An,
* Trác Lớn Island, or Phú Hưng
* Trác Nhỏ Island, or Phú Thịnh
* Tre Lớn Island, or Phú Hòa
* Tre Nhỏ Island, or Phú Hội,
* Anh Island, or Trứng Lớn Island
* Em Island, or Trứng Nhỏ Island
Thứ phi Hoàng Phi Yến
Thứ phi Hoàng Phi Yến, or Imperial Concubine Phi Yến, is a controversial
local legend from the Côn Đảo archipelago. According to the legend she was the concubine of Lord
Gia Long
Gia Long (Chữ Hán, Chữ hán: 嘉隆) ( (''Hanoi, North''), (''Ho Chi Minh City, South''); 8 February 1762 – 3 February 1820), born Nguyễn Phúc Ánh (阮福暎) or Nguyễn Ánh (阮暎), was the founding emperor of the Nguyễn dynas ...
(Nguyễn Phúc Ánh) and gave birth to a son known as Prince Cải, she advised Lord Ánh not to ask foreigners for help as that would make their victory less glorious and might cause issues in future, these comments caused Lord Ánh to be suspicious of her motives and to lock her up in a cave. Later when their toddler asked where his mother was he killed him. 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". This caused the villagers of Côn Đảo to hold a festival in her honour every year.
References
Further reading
*
External links
Con Dao photos* The Kun Lun Shan islands are shown on sheet 11 of the
Mao Kun mapbr>
Wu Bei Zhi at the Library of CongressVietnamese Sea and Islands – position Resources, and typical geological and ecological wonders. Publisher Science and Technology. Ha Noi, Editor: Nguyen Khoa Son . In Vietnamese
{{DEFAULTSORT:Con Dao
Districts of Bà Rịa-Vũng Tàu province
Bà Rịa-Vũng Tàu province
Archipelagoes of Vietnam
Landforms of Bà Rịa-Vũng Tàu province
Former British colonies and protectorates in Asia
States and territories established in 1702
Former populated places in Vietnam
Islands of the South China Sea
Former penal colonies
1702 establishments in the British Empire