Con Dao is an archipelago off the name of Ba Ria-Vung Tau, Vung Tau to 97 knots and 45 knots Hau River. Con or Con Son Island as well, or to name the largest island in the archipelago. Vietnam History 20th century is often called the island of Con Son Island or Kunlun mountains. Former name in the text is in English and French Poulo Condor. In 1977, the National Assembly of Socialist Republic of Vietnam has decided to officially name the island. Con Dao is also the administrative district of Ba Ria-Vung Tau.