Shanwu
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Youyu County 右玉县 |
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 Youyu
Location in Shanxi
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| Coordinates: 39°59′20″N 112°28′01″E / 39.989°N 112.467°ECoordinates: 39°59′20″N 112°28′01″E / 39.989°N 112.467°E | |
| Country | People's Republic of China |
| Province | Shanxi |
| Prefecture-level city | Shuozhou |
| Time zone | China Standard (UTC+8) |
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| Yanmen Commandery | |||||||||
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| Literal meaning | Yanmen Pass Commandery | ||||||||
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Youyu County, also known by its Chinese name Youyuxian, is a county in Shuozhou Prefecture, Shanxi Province, China. It borders Inner Mongolia to the north and west.
Shanwu, south of present-day Youyuxian, was the seat of Yanmen Commandery during the Qin and Western Han. The post moved to Yinguan southeast of present-day Shuozhou under the Eastern Han and further south to Daixian under the Kingdom of Wei.
Elevations are generally higher in the south of the county, in which flows the Cangtou River (); Youyu reaches a north-south extent of 67.7 km (42.1 mi) and east-west width of 45.7 km (28.4 mi). The Great Wall demarcates the northwestern border with Inner Mongolia's Liangcheng and Horinger counties; within the province, Youyu borders Zuoyun County to the east, Shanyin County and Pinglu District to the south.
Youyu has a monsoon-influenced, humid continental climate (Köppen Dwb), with cold and very dry winters, and warm, humid summers. The monthly 24-hour average temperature ranges from −14.4 °C (6.1 °F) in January to 19.5 °C (67.1 °F) in July, and the annual mean is 3.93 °C (39.1 °F). June thru September accounts for over three-fourths of the 410 millimetres (16 in) of annual precipitation. Due to the high elevation and dry climate, the diurnal temperature variation averages 16 °C (29 °F) annually.
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