Introduction to Ji'an Ridge: Ji'an Ridge is located about 2 kilometers northwest of the Ma'anling volcano. It is an endoparasitic volcano. It is characterized by its large scale and eruption time of more than 10,000 years. The volcanic ash has weathered into brown soil. The fertile land is suitable for planting various crops. , more than 1,000 people living in an area of ​​3 square kilometers rely on pastoral farming in Ji'anling volcano to survive.