The sign says “Dangerous Zone” (song playing in my mind: Danger Zone from Topgun) and I can see why, in front of me, massive amounts of muddy brown Mekong waters go cascading down the cliffs in a series of steps, smaller falls feeding into each other, building up to the big one just in front. The roar is almost deafening, it drowns out the sounds of the other tourists nearby. The sign has been put up because while there is a fence, it looks none too sturdy and the ground is uneven and strewn with rocks. Trip, and you could go crashing through the fence, down into the churning water.