Thansadet Waterfall is located on the east side of Koh Phangan and about 15 kilometers from Thong Sala. You can access the place both by land and by water.
Thansadet Waterfall is the biggest waterfall of Koh Phangan. His majesty the kings of the Chakri dynasty such as King the fifth, the sixth, the seventh, the ninth, and Queen Rampaipannee have visited this waterfall and have given the name to the waterfall. They have also inscribed their abbreviated titles and date which they have visited on the stone near the waterfall.