Tianchi Introduction: In the foothills of Guanluo Mountain in Ningwu County, there are 15 natural lakes of various sizes, the largest of which is Tianchi. The lake has an altitude of 1,771 meters, an area of 0.8 square kilometers, and a water depth of about 10 meters. The lake is rich in carps. In the Tang Dynasty, the Loufan horses produced were as famous as the horses produced in the Western Regions.