city in Hebei province, NE China, at a gateway of the Great Wall of China: pop. 606,000
See Zhangjiakou in American Heritage Dictionary 4
(jängˈjyäˈkōˈ) also Kal·gan(kälˈgänˈ)
A city of northeast China near the Great Wall northwest of Beijing. It was a commercial and military center under the Ming and Manchu dynasties. Population: 681,000.