KOH SAMUI THAILAND Koh Samui is in the Gulf of Thailand, about 35 km northeast of Surat Thani town . It is the most significant island in the Chumphon Archipelago. The island measures some 25 km at its widest point. It is surrounded by about sixty other islands, which together compose the Ang Thong Marine National Park (Mu Ko Ang Thong National Park) and include many other popular tourist destinations, including, Ko Pha Ngan, Ko Tao, and Ko Nang Yuan. The central part of Koh Samui is an almost uninhabitable tropical jungle mountain called Khao Pom, peaking at 635 m. The various lowland and coastal areas are connected by a single 51 km road, running mostly along the coastline and encircling the bulk of the island.