Pai yen ching, Yen-yuan, China (Google Maps ⧉, OpenStreetMap ⧉)
Referenced In
The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano"… regarding salt he writes (p. 121): “The brine wells from which the salt is derived lie at Pai yen ching, 14 miles to the south-west of the city [of Yen-yuan] …"