Nam Du IslandsNam Du Islands is an archipelago located in the Gulf of Thailand, southeast of Phú Quốc Island. It constitutes An Sơn and Nam Du Commune of Kiên Hải special administrative zone, An Giang Province, Vietnam.GeographyThe archipelago consists of 21 large and small islands. The largest island is Hòn Lớn Island with a peak of 309 m. Islands have tropical monsoon climate; the rainy season lasts from April to October every year.