Namtok Chum Saeng or Namtok Sai Rung This is located in Ban Pak Chan, 80 kms. north of Ranong or 16 kms. from Amphoe Kra Buri. It is accessible by Highway No. 4 and then turn left at Km. 529-530 onto the laterite road for another 3 kms. The waterfall looks most beautiful when a colourful rainbow sometimes appears on the spray of the waterfall on a sunny day.