Before revision: The line is believed to have served as the border between Chinese dynasties, between the Northern and Southern dynasties of c. 3th–6th century and between the Southern Song of c. 13th century and its northern neighbor
After revision: The line has served as the border between northern and southern Chinese dynasties:Jin dynasty between the Northern and Southern dynasties of c. 3th–6th century and between the Southern Song of c. 13th century and its northern neighbor