The Mekong during the rainy season
You could hear the roar of this torrent of water from the other side of the island. I followed the sound until I found this inimidating barrage of water. I found out that this set of rapids is what caused the French to install the railway tracks on the island. Park up at one end of the short island, off-load cargo to train, train crosses 1km island, another boat picks up on other side of island - rapids dealt with.