The most beautiful view of Sai Rung Waterfall is when sunlight shines down on the waterfall and drops from the steep cliff. When the angle between the light and the water mist is just right, you will see a dazzling rainbow. It is a natural phenomenon that is worth seeing. The time when this rainbow can be seen is usually between 11.00-16.00. Here, it originates from the source of the mountain at Khao Chedi, which becomes the bamboo canal flowing down to the southwest. Inside the area is the Ramkhamhaeng National Park (Khao Luang) ranger station. The waterfall has 4 levels in total. You can swim by walking from the park ranger station up the stream for 800 meters, 900 meters, 1,160 meters, and 1,200 meters, respectively. Location: On the west side of Khao Luang, 50 meters from Ramkhamhaeng National Park (Khao Luang).