Wikipedia
Lake Namtso is a sacred lake in Damzhung county, northeast of Lhasa. It is home to five islands that are used as retreats for practitioners. There are also numerous monasteries in the surrounding region, as well as many well-known hermitages. Among the many masters said to have practiced at these sites, Padmasambhava and his consort Yeshe Tsogyel are frequently associated with the nearby caves.