The unification of China by the Qin Dynasty saw the incorporation of Jiangxi into the Qin empire. The First Emperor of Qin established seven counties in Jiangxi, all of them administered from the commandery seat of Jiujiang, located north of the Yangzi in modern Anhui. All of the commandery seats were located along the Gan River system. Military settlements were known to have existed at least two of the counties. The Qin colonisation formed the earliest settlement structure in Jiangxi and which for the most part, has survived to the present day.