Xi'an is located with its south to Qinling Mountains and its north to the Weihe River. It has fertile soils and crowded rivers. The climate is warm and humid and the natural environment is fine. The types of mountainous young plants are numerous. The plain abounds in grain, cotton and various kinds of fruit. Due to the increase of the earth's surface heat, there are 5 big earth heat areas inside Xi'an City, and all of them have hot mineral water with high medical value.