Photo taken on July 21, 2019 shows the engraved stones by the Mapam Yumco Lake in Burang County of Ngari Prefecture, southwest China's Tibet Autonomous Region. Located on an altitude of 4,588 meters at the Qinghai-Tibet Plateau, the 412-square-kilometer lake is a sacred Hindu and Buddhist site as well as a renowned tourist attraction. (Xinhua/Chogo)