Erui.

River Erui was the boundry between the provinces Lebennin and Lossarnach in Gondor. It runs about 75 miles from Ered Nimrais in the north-west to the outflow in the great Anduin halfway between Osgiliath and Pelargir.

Some 30 miles from the offspring is the Crossing of Erui where the South Road came from Minas Tirith to Pelargir.