The Four Mother Rivers are the four rivers that have traditionally been the center of Gwenithen Commerce and life. They are, from West to East:
The River Alena, which forms the Western Border of Gwenith
The River Faile, which separates the Westlands from the Eastlands
The River Russal, which separates the Eastlands from the Riverlands
and the River Lein, which forms the Eastern Border of Gwenith