China Historical GIS, Harvard University and Fudan University CC BY-NC 4.0 https://maps.cga.harvard.edu/tgaz/placename/hvd_111432 東畿觀察使 东畿观察使 Dongjiguanchashi 防镇 防鎮 fang zhen defense command 756 4 763 4 POINT point N 34.66528 E 112.38263 唐 Tang CHGIS