楚河汉界

lit. the river that divides Chu and Han / fig. a line that divides rival territories / the mid-line between sides on a Chinese chessboard

river / CL:條|条[tiao2],道[dao4]

(bound form) boundary; border / (bound form) realm

Han ethnic group / Chinese (language) / the Han dynasty (206 BC-220 AD)

man

surname Chu / abbr. for Hubei 湖北省[Hu2 bei3 Sheng3] and Hunan 湖南省[Hu2 nan2 Sheng3] provinces together / Chinese kingdom during the Spring and Autumn and Warring States Periods (722-221 BC)

distinct / clear / orderly / pain / suffering / deciduous bush used in Chinese medicine (genus Vitex) / punishment cane (old)