Than Sadet is the most famous waterfall in Koh Phangan. The waterfall consists of three parts which provide water all year round, even at the worst of the dry season. Three Kings of Thailand have left their marks here on the rocks. Than Sadet waterfall is best accessible from Than Sadet beach, making it a popular stop during a day trip from Koh Samui. Due to its remoteness, Than Sadet beach is snorkeling-friendly with few souls around.