River Iralell
From Tar Valon Library
A similar entry appears in the Wheel of Time Companion confirming the information available in the main story arc.
The Iralell is a river in unclaimed land. It's source is in the Spine of the World and from there it passes through Haddon Mirk before joining the Erinin. As Haddon Mirk is mostly uninhabited, it is likely no villages lie on its path.
(Reference: Map)