some 10 kilometers west of Pattaya Strait or 600 meters away from Ko Lan. Ko Sak is another small island shaped like a horse shoe with an area of 0.05 square kilometers. It has two beaches, one on the northern cover 250 meters in length, an area in which boats usually stop for tourists to swim and another one on the southern part of the island opposite the first island, with a pathway linking the two beaches, a small beach 80 meters in length. A coral reef is found at the area in front of the beach. Skin-diving is also possible in this vicinity.