Ko Samui District is with the state in the Gulf Islands in the area of Surat Thani province. 1 area in 3 is flat, which is surrounded by mountains. Major destinations of the Gulf Coast. Ko Samui is the area of the various islands together a total of approximately 252 square kilometers. Only the island itself has an area of about 228 square kilometers. Is the second largest island in three of the island and the island.