Referenced In

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"…the eight days’ journey through richly cultivated plains run up the basin of the Wei River, the most important agricultural region of North-West China."

The Travels of Marco Polo
by Marco Polo, da Pisa Rusticiano

"Wei River in Shen-si, ii. 27n, 29n, 35n"