Ko Tarutao Marine National Park consists of 51 islands in two main groups scattered across the Andaman Sea in southernmost Thailand. Just seven of the islands are of any size, including Ko Tarutao in the east, and Ko Adang-Ko Rawi to the west. Just 5 miles (8km) to the south lies the marine frontier with Malaysias celebrated Langkawi Archipelago. Tarutao is world-famous for its pristine diving sites, rich marine life and outstanding natural beauty. Covering a broad area of 575 sq miles (1490 sq km), Tarutao became Thailands second national marine park in 1974. Because of the location of the islands so far out to sea, the park is only safely accessible during the northeast monsoon between November and April.