About two hours by boat from Luang Prabang along the Mekong River up to the north, Pak Ou Caves or Tham Ting Caves are located on the left bank of the Mekong and the mouth of the Nam-Ou. There are two caves in the lower part of a limestone cliff
facing the river.
Stairs connected a second, deeper cave known as Tham Phum, which requires a flashlight for viewing inside the cave.
I took a slow boat to there. But if you would love to try something in challenge, you may take a speed boat, a quicker boat, which is risky and more suited to the Indiana Jones type!