Oxus River, Central Asia (Google Maps ⧉, OpenStreetMap ⧉)

"It begins on the further bank of the River Jon, and extends northward to the territory of the Great Kaan."

"Jon (Jihon, or Oxus) River, ii. 458, 466"

"Oxus Valley and River, i. 152n, 161n, 172n, 173n, ii. 594n"