Leaving Luang Prabang in the morning by road you travel first to Nong Khiaw, from where you are transferred by boat upstream to Muang Ngoi on the banks of the Ou River.
The Ou River is a tributary of the Mekong and its valley has some of the most stunning scenery in the whole of Laos. You will take longtail motorboats to cover the distance through the valley back to Luang Prabang, stopping en route to visit some of the local hill tribe villages and the holy Pak Ou Caves.
Here there is a huge limestone cliff, containing within it two caves of special religious significance to the local population. The King of Luang Prabang often used to make pilgrimages here, and the caves are crammed full of Buddha images. The lower cave can be seen in natural light, whereas the upper cave (a steep five-minute walk up steps) requires a torch.