The Nam Ou is one of the most important rivers of Laos running from the south to the north of the country for more than 450 km through the provinces of Phongsaly, Oudomxay and Luang Prabang. Along the way, the river passes through dense forested mountains, valleys and limestone cliffs thus getting fertile throughout before finally joining the Mekong River.
The river enables boat transportation, due to which hundreds of towns can navigate. The river is a popular destination for adventure seekers and travelers who indulge in various activities including Kayaking and hiking along the river through forests. The confluence with the Mekong happens near Luang Prabang town, close to Pak Ou Caves known for Buddha statues.
The Nam Ou is home to more than 80 species of fish, otters, reptiles and provides food for many migratory wild birds that depend on the river for their livelihood.