 The Holy Medical Spring Resort has both two indoor swimming pools and one outdoor swimming pool, all filled with hot springs water.Bathing is allowed at an altitude of 4200m AMSL, likely making it the highest swimming pool in the world.The YBJ International Cosmic Ray Observatory (羊八井国际宇宙线观测站) is located in the Yangbajing valley of the Tibetan highland, a site chosen for its high altitude at 4300 meters above sea level.