Koh Similan or Koh Paet is the largest island of this group. It has a distinctive horseshoe-shaped bay and the average depth of the water is 60 feet. Underwater is full of rock formations and coral reefs in several shapes and forms such as deer, leaf, brain, and mushroom. The latter one is the most unspoiled coral found in the country. Its white sand beach is beautifully soft and very stunning. Diving around here is the must as it allows you to touch the real underwater world that full of fish and corals. To the north, lies a striking large rock formation with astonishing shapes such as boot and Donald Ducks head. The upper part of the beach is an ideal lookout point with a rock of a sailing boat shape.