Satun Province
Ko Tarutao island () is the largest island of Tarutao National Marine Park in Satun Province of southern Thailand. The island is long and wide. It is one of the most unspoiled islands in Andaman Sea and in all of Thailand. Ko Tarutao is located about north of Langkawi Island in Malaysia. The Malay word "tertua" or "tarutao" means "old" and "primitive".