Start the day by crossing the river and heading south to visit the breathtaking Khon Phapheng Waterfall, often called the “Niagara of the East” and recognized as the largest waterfall in Southeast Asia. Here, the mighty Mekong River dramatically splits, creating a natural wonder near the Cambodian border. After exploring the falls, you will either: Continue cycling towards the Cambodian border, or transfer by vehicle to the Thai border, depending on your travel route.