Miyun District (Miyun County), is under the jurisdiction of Beijing. It is located in the northeast of Beijing, between 40 ° 13 ′ 7 "- 40 ° 47 ′ 57" north latitude and 116 ° 39 ′ 33 "- 117 ° 30 ′ 25" east longitude. It is 69 kilometers long from east to west and 64 kilometers wide from north to south. It is the junction of the Yanshan Mountains and the North China Plain. It borders Pinggu District, Shunyi District and Huairou District from the southeast to the northwest, and Luanping County, Chengde County and Xinglong County in Hebei Province in the north and east respectively. It is an important gateway from North China to Northeast China and Inner Mongolia, so it is known as "the key to the capital", and an important drinking water base and ecological conservation area in Beijing. With a total area of 2229.45 square kilometers, it is the largest district in Beijing. According to the data of the seventh population census, as of 0:00 on November 1, 2020, the permanent resident population of Miyun District was 527683. It has jurisdiction over 17 towns, 2 streets and 1 township (regional office).

Miyun District has both mountains and rivers, and its natural landform is characterized by "eight mountains, one water and one field". The mountainous area accounts for 4/5 of the total area, and the water source protection area accounts for 3/4 of the total area. The forest coverage rate of the whole region reached 73.63%, the content of negative oxygen ions in the air was 40 times higher than that in the urban area, and the ecological quality ranked first in the city. The main specialties of Miyun District include Miyun chestnut, red fragrant crisp pear, royal plum, "Yunxiu" plum, fried chicken breast, etc.

In 2021, Miyun District will achieve a GDP of 36.03 billion yuan, an increase of 7.5% over 2020 at comparable prices.