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(yü-mŭn), city, NW Gansu prov., China. It was long one of China's leading petroleum centers, with oil fields and refineries, but output has steadily declined since the 1960s. Yumen, on the Old Silk Road to Xinjiang, is named for an ancient gateway in the nearby Great WallGreat Wall of China,
series of fortifications, c.3,890 mi (6,260 km) long (not including trenches and natural defensive barriers), winding across N China from Gansu prov. to Liaoning prov.
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. It is on the railroad that connects Lanzhou and Xinjiang.



(also Laochiinmiao), a city in Northwest China, in Kansu Province. Yiimen is served by the Lan-Shin (Lanchou-Urumchi) Railroad. An oil-field center since 1939, the city is linked to Lanchou by an oil pipeline and has two refineries. After new oilfields, such as Tach’ing, were developed in Northeast China in the 1960’s, Yümen lost its importance as the chief center of the petroleum industry of the People’s Republic of China.

References in periodicals archive ?
Yumen is a small city in western Gansu province, which borders Xinjiang.
Yumen Pass, situated 75 kilometers northwest of Dunhuang, is a history-loaded famous sightseeing area in China.
Yumen was built as a safe guard in the early Han Dynasty when the Huns ceaselessly invaded the Han's area.
Yumen Pass was also a strategic passage of the famous Silk Road in ancient China.
The mention of the Yumen in the poem has made the pass all the more famous.
of Singapore) looks at how the equipment, infrastructure, and trained labor force of the Fushun oil shale industry, developed in Japanese occupied Manchuria during the 1930s, and the Yumen oil field in Western China contributed to China's efforts to discover and exploit the Daqing oil field in Northeast China.
Honeywell UOP has an 80-year history in China, beginning in 1937 when it built one of Chinas first refineries in Yumen.
Run on the Yumen field in an offset vertical seismic profile application, the results were processed in real time at the well site and identified the proximity of granite formations that enabled the client to review and change drilling plans accordingly.