If Thailand's tropical islands are the country's crowned jewels, Ko Surin could be the brightest of them all. The Surin Islands is an archipelago of five islands in the Andaman Sea, 60 km from the Thai mainland.the islands are part of Tambon Ko Phra Thong, Amphoe Khura Buri, in Phang Nga Province, Thailand. Protected as the Mu Ko Surin National Park, Ko Surin actually consists of two relatively small islands — Ko Surin Nuea (north) and Ko Surin Tai (south) — as well as a handful of islets and some magnificent underwater seascapes.