Draklha Lubuk is a cave with chapels within Chakpori that is said to date to 645, during the time of Songtsen Gampo. The cave is said to be the location where nagas from marshlands of the Jokhang were placed during the construction of the shrine. At the time of his death, Nyang Tingdzin Zangpo is said to have dissolved into rainbow light at the cave. According to tradition, Princess Wencheng is said to have stayed in one of the chapels.