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city in northwestern Hebei sheng (province), northern China. Kalgan, the name by which the city is most commonly known, is from a Mongolian word meaning "gate in a barrier," or "frontier." The city was colloquially known in Chinese as the Dongkou ("Eastern Entry") into Hebei from Inner Mongolia. It is about 100 miles (160 km) northwest of Beijing. Pop. (2002 est.) city, 688,297; (2007 est.) urban agglom., 1,046,000.