|“||If Sanyou were to actually fall to Qin they will have acquired a large stepping stone towards China's central regions.||”|
— Ri Boku, about the Battle of Sanyou
It is located south east of Qin and lies next to Chiyoyou.
The city was taken from Wei by Qin in the Sanyou Campaign.
Sanyou was used as staging point for future expansion by Qin and renamed Tougun.