Fig. 1

a The geographic location of the site of Fenghuangzui in MYRV and b the layout of the walled town revealed by shovel probes at the site. Red, thick lines on the map delineate the provincial boundary of Hubei

a The geographic location of the site of Fenghuangzui in MYRV and b the layout of the walled town revealed by shovel probes at the site. Red, thick lines on the map delineate the provincial boundary of Hubei