China Historical GIS, Harvard University and Fudan University CC BY-NC 4.0 https://maps.cga.harvard.edu/tgaz/placename/hvd_111538 安黃節度觀察使 安黄节度观察使 Anhuang Jieduguanchashi 防镇 防鎮 fang zhen defense command 799 4 802 4 POINT point N 31.26371 E 113.68892 唐 Tang CHGIS