A view of the canyon scenery in Gyirong county of Xigaze city, southwest China's Tibet autonomous region on April 28, 2019. The vast drop in altitude in Gyirong county, known as the "backyard garden of Mount Qomolangma", makes the ecological environment unique, with crystal-clear lakes and towering mountain peaks creating a mesmerizing scene. Mount Qomolangma is known as Mouth Everest in the West. [Photo/Xinhua]