The northern-most extreme of the Mekong River in Laos is found in Muang Sing. As the Mekong rushes out of China into the Green Triangle bordering Myanmar, it makes its way through steep canyons before slowing down further south. This section can be accessed by boat from Xiengkok in Long District, but also by gravel road leading across the mountains from Muang Sing down to Xieng Khaeng. On this remote and beautiful stretch of the river are some of the oldest Tai Lue settlements in the district: Ban Xay and Ban Xieng Khaeng. Those looking for adventure can explore Xieng Khaeng on a 2, 3, 4, 5, and 7 days trek and river cruise or on a 4WD tour to be booked by Phou Iu Eco-Tourism Laos or Phou Iu Bungalows in Muang Sing.