In the early 17th century, Phu Quoc was a desolate area, where Vietnamese and Chinese immigrants earned their living from sea cucumbers. From 1782 to 1786, Phu Quoc became a stronghold of Lord Nguyen Anh, later Emperor Gia Long, in his confrontation with Tay Son forces. In 1869, the French occupied it and set up rubber and coconut plantations in the island. From 1967 to 1972, a P.O.W detention camp of 40,000 inmates during the war covering on 400 hectares was built at An Thoi by the Saigon regime. After being liberated on 30 April 1975, Phu Quoc has been converted into an ideal tourist destination for nature and sea lovers.