The raft slips from the bank and the river takes over—clear, cool water threading through folded green hills and neat rice terraces. Birdsong and the distant thud of villagers tending paddies give the first half-hour a domestic calm; then the Jangkok nudges the boat, offers a playful push, and the guides call commands that convert nervous laughter into a steady stroke. Over 6.5 kilometers you’ll move between wide, swim-friendly pools and short streaks of white water that rise to class II–III—enough to raise your pulse without demanding technical runs.