It is an island paradise with numerous beautiful coves and bays, and dense jungle, and covers an area of 135 sq. kms of which 75 percent covers the sea area, and stretches to within 15km of the maritime border with neighbouring Myanmar (Burma). The coral colonies surrounding the islands are the most well developed in Thailand, and are also considered some of the most beautiful. Some of the reefs surrounding the five islands slope relatively gently to the seabed, and are at shallow depths, thus providing excellent snorkelling.