The Red Fox River is a tributary of the Gullik River that flows through southeastern Irrisen. It originates in the northern Kodar Mountains and heads northward before turning eastward near the town of Nadzieja Lato. After flowing eastward for under 100 miles, it turns north and eventually flows into the Gullik. For its entire length, the Red Fox forms the border between Irrisen and the Realm of the Mammoth Lords.
Varisian merchants use the Red Fox to transport goods from the Realm of the Mammoth Lords into Irrisen.