Côn Sơn Islan (Vietnamese Côn Sơn) is the largest island of the Côn Đảo archipelago, off the coast of southern Vietnam. The island is also known after its Malay name as Poulo Condore, this name being well-known during the times of French Indochina. In 1702, the British East India Company founded a settlement on the island of Poulo Condor off the south coast of southern Vietnam, and in 1705 the garrison and settlement were destroyed. In 1861, the French colonial government established a prison on the island to house political prisoners. In 1954, it was turned over to the South Vietnamese government, who continued to use it for the same purpose. Not far from the prison is Hang Duong Cemetery, where some of the prisoners were buried.