St. Martins Island : St. Martins Island is the most beautiful Coral Island where you will find live corals. Its only 30 km from Teknaf and you can go there by local motorboat, tourist boats, or sea truck. It’s possible to walk around the island in a day because it measures only 8 sq km (3 sq mi), shrinking to about 5 sq km (2 sq mi) during high tide. Most of island’s 5500 inhabitants live primarily from fishing, and between October and April fisher people from neighboring areas bring their catch to the island’s temporary wholesale market.