The altitude of Yumen in Gansu is between 1,000 and 1,500 meters. People will not suffer from altitude sickness in it.

Yumen is a county-level city under the jurisdiction of Jiuquan City, Gansu Province. It is located in the northwest of Gansu Province and the west of the Hexi Corridor. It is connected to Jiayuguan City and Jinta County to the east, Guazhou County to the west, and Suzhou to the north and south. The Northern Mongolian Autonomous County is adjacent to it, located between 96°15'-98°30' east longitude and 39°40'-41°00' north latitude. It is 114 kilometers long from east to west and 112.5 kilometers wide from north to south. The total area under its jurisdiction is 13,500 square kilometers.

Yumen City governs two urban areas, the old and new, and four towns and six townships, with a total population of 190,000, including an urban population of 130,000. Its unique geographical location and convenient transportation and communication conditions, as well as its harmonious development with central and provincial large and medium-sized enterprises, give it comparative advantages in developing clean energy, industrial processing, deep processing of agricultural and sideline products, trade circulation and service industries.

The incidence of altitude sickness is related to the speed of climbing the mountain, altitude, length of residence and physical fitness. Generally speaking, when people from the plains quickly enter a plateau with an altitude of more than 3,000 meters, 50 to 75% of people will suffer from altitude sickness. Of course, the probability of altitude sickness is also different for people with different physical constitutions. If you are in good physical condition, the probability is low. And the longer you live, the more likely it is to happen.