Introduction to Tianchi: It is located on Tianchi Ridge, 74 kilometers northeast of Aershan, with an altitude of 1,332.3 meters, ranking third in the country, and has 484 steps. It is 450 meters long from east to west and 300 meters wide from north to south, covering an area of 13.5 hectares. There is neither a water inlet nor a water outlet, but it never overflows after long rains and never dries up after long droughts, which is amazing to the world. The level is like a mirror, reflecting the green pines and cypresses, the blue sky and white clouds, and the myriad scenery.