Mardanas Island is an island in the municipality of Sitangkai, Tawi-Tawi. With an area of . It is officially known as Siluag in the 1939 Census Atlas of the Philippines, however locals and the Philippine Navy disputes this name. It is one of the last islands of the Sulu Archipelago nearest the Philippine-Malaysian border and is next to Panguan Island. See also List of islands of the Philippines Philippine Navy Andulinang Island Panguan Island Panampangan Island References External links Mardanas Island at OpenStreetMap Islands of Tawi-Tawi