The northwest province of Oudomxay is home to Chom Ong Cave, one of Southeast Asia’s 10 longest caves at a length of over 18 km, in which the first 800 meters have been paved and lightened. Just outside this cave, you can visit a small traditional village of the Khmu ethnic group, the main inhabitants of the province and come to adore how they live and work. Laos always knows how to reward adventure lovers, and in the case of Oudomxay, it is the Nam Kat Waterfall awaiting you deep inside the tropical forest. Considered as the symbol of the province, Phu That Stupa sits on top of the hill at the center of Muang Xai Town. This 600-year-old stupa is of spiritual significance to people in the region, hosting religious celebrations on every full moon day.