Sonadia Island is a sanctuary for migratory birds such as petrels, snipe, shanks, lapwings, geese and ducks and other waterfowl. According to legend, a ship laden with gold sunk here centuries ago during an attack by Portuguese pirates and an island formed around the shipwreck. It is only seven kilometer from Cox’s Bazar and about nine square kilometer in area.
The western side of the island is sandy and different kinds of shells are found on the beach. Off the northern part of the island, there are beds of window pane oysters.
It was once renowned for pink pearls, but more profitable commercial fishing has seen this tradition slowly fade away. During the winter, the fisherman set up camp. And dry their catches of sea fish.