Miyun County, located in the northeast of Beijing, belongs to the junction of Yanshan Mountains and North China Plain. It is surrounded by mountains in the east, north and west, with undulating peaks and majestic ancient Great Wall stretching over the mountains. Miyun Reservoir has blue waves in the middle, alluvial plain in the southwest, dustpan-shaped, surrounded by mountains on three sides, low in the middle and open in the southwest.
Miyun county has a total area of 2229.45 square kilometers, accounting for 13% of the city's total area, and is the largest county in Beijing. The mountainous area of the county accounts for 79.5%, 177 1.75 square kilometers; The plain area accounts for 1 1.8%, accounting for 263.4 square kilometers; The water surface area accounts for 8.7%, 194.3 square kilometers. Miyun County governs 17 towns, 2 streets and 1 regional offices: Miyun Town, Xiwangzhuang Town, Xitian Gezhuang Town, Shilibao Town, Henan Zhai Town, Jugezhuang Town, Mujiayu Town, Taishitun Town, Gaoling Town, Bulaotun Town, Fengjiayu Town, Gubeikou Town and Dachengzi Town.