Surrounded by mountains and pristine jungles, the Than Sadet waterfall is located on the eastern coast of Koh Phangan close to the Haad Than Sadet Beach. In 1888 the King Rama V and his royal family visited the Than Sadet waterfall and left an inscription on a giant granite boulder as a memorial. Many other royals have visited the waterfall throughout the years including the former monarch, King Bhumibol Aduljadet, who took water from the waterfall to use at Royal ceremonies.
The Than Sadet waterfall consists of many flat, giant granite boulders that are connected to each other by a set of natural pools. Each of these pools has their own miniature water cascades that stretch for about 3 kilometres.