Miyun Reservoir, Artificial lake in Miyun, Beijing, China

Miyun Reservoir lies in Miyun District, Beijing, where the Chao and Bai rivers meet. Its two main dams and five auxiliary dams total 4,559.8 metres in length; the Bai River main dam is a 66.5-metre-high earth dam with a 960-metre crest. The reservoir covers 188 square kilometres and holds 4.375 billion cubic metres.

Construction began in September 1958 and finished in 1960 to control floods, support farming, and supply the growing city of Beijing. Since the 1980s, it has become the primary drinking water source for the city, serving more than 11 million residents daily.

The reservoir has served as a central resource for local communities, with fishing and water use shaping daily life and settlement patterns around its shores. Today, its status as Beijing's primary water source defines how the area functions and how people interact with the landscape.

The reservoir sits in a mountain setting with open views and quiet surroundings suitable for outdoor exploration. A long road called Huanku Road runs along the water for about 110 kilometers (68 miles), providing access to different points around the shoreline.

The reservoir's dams are designed for a once-in-a-thousand-year flood and checked against a once-in-ten-thousand-year event, with a crest elevation of 160 meters. The highest water level ever recorded, 153.98 meters, is marked by a monument at the site. The reservoir is managed as a fully closed area, and fishing has been banned since 2003.