Con Dao

Con Dao Islands are an archipelago of Ba Ria–Vung Tau Province, in the Southeast region of Vietnam, and a district of this province. Situated about 185 km (115 mi) from Vung Tau and 230 km (143 mi) from Ho Chi Minh City, the group includes 16 mountainous islands and islets. The total land area reaches 75.15 km2 (29.02 sq mi) and the local population is about  5,000.

The islands are composed of magmatic rocks of different ages. Hon Bay Canh, Hon Cau, Hon Bong Lang composed of Cretaceous microgranit rocks. The Northern part of Con Dao Island composed of quartz diorite and granite - granodiorit of late Mesozoic- early Cenozoic age, and is partially covered by Quaternary marine sediments. The Southern part of this island and Hon Ba island are composed of the riolit and intrusive formations of unknown age. On the western slope of Con Dao Island, there exist of outcrops of diorite and microgranit penetrated by big quartz bands