幽云十六州 (幽雲十六州) yōuyún shíliù zhōu

yōuyún shíliù zhōu proper noun Sixteen Prefectures
Domain: History 历史 , Subdomain: China , Concept: Region 地区
Notes: An area of contention between Han Chinese and the Khitan People, stretching from present day Beijing (Yan) to Yungang Caves near Datong, Shanxi