One of the most heavily traveled waterways in Avistan, easily one of the longest rivers on Golarion. Plays an incalculably important role in the trade and culture of all the nations of central and northeastern Avistan. Originates in the Lake of Mists and Veils north of Brevoy and flows south to the Inner Sea at the Taldan port of Cassomir.
It has three branches that begin in the north of Avistan and all meet in Kallas Lake at the southern edge of the River Kingdoms. From that point, it becomes one massive river that flows south to the sea.
First Reference: Chapter 37
Other Notable References: Chapter 90, Chapter 135, Act IV Interlude Part 1