Fúzhōu

Fuzhou was an old frontier prefecture in the mountains northeast of Songpan, near the upper reaches of the Bailong River. Its seat lay at Tongchang, in the country of deep valleys leading between Sichuan and the lands to the north. Under the Sui the prefecture became Tongchang Commandery, which governed a number of mountain counties; the name Fuzhou returned under later dynasties. Its location placed it among the passes and river routes that connected the highlands with the eastern approaches to Sichuan.