Surin Island located in Phang-Nga, Southern of Thailand. There are 5 islands named Koh Surin Nua, Koh Surin Tai, Koh Ri, Koh Kai and Koh Klang. The two well-known islands are Koh Surin Nue and Koh Surin Tai. Besides, Richelieu Rock is the most attractive dive site in the world.