Chong Samui is entered between Laem Kho Khao (9°13'N., 99°53'E.) and Laem So, the S extremity of Ko Samui. Laem Kho Khao is conspicuous, consisting of five peaks, one of which is 237m high. Khao Chai Son, 535m high, lies 2.5 miles NW of Laem Kho Khao. Hills back the coast NNW of the latter point, and depths of less than 10m extend up to 1.5 miles off the intervening points.

Location