Located south of Phu Quoc approximately a 45 minute boat ride from Duong Dong. An Thoi Archipelago is made up of a collection of some 15 islands/islets including the largest being Hon Thon (Pineapple island), followed by Hon Roi (Lamp Island), Hon Dam (Shadow Island), Hon Dua (Coconut Island), Hon Vang (Echo Island), Hon May Rut (Cold Cloud Island), Hon Dam (Shadow Island), Chan Qui (Yellow Tortoise Island) and Hong Mong Tay (Short Gun Island).
The topography in this group of island varies considerably from the 60m deep strait between southern Phu Quoc island and Hon Dua Island and gentle sloping coral gardens off other islands. These islands also support some seagrass gardens which are more common off the eastern side of Phu Quoc, and home to the rarely seen Dugong. The archipelago is home to an abundance of smaller tropical fish, with the occasional grouper, tuna and mackerel also sighted.