A prefectural city in the province of Seech`uen, China, in 30 N., 103° E.; pop. about 40,000. It is situated in a valley on the banks of the river Ya, where tea is grown. The town owes its importance to the fact that it stands at the parting of the tea and tobacco trade route to Tibet via Tachienlu and the cotton trade route to west Yun-nan via Ningyuen-Fu. The city wall measures 2 m. in circumference, and is pierced by four gates. Yachow-Fu is first mentioned during the Chow dynasty (1122-255 B.C.).