The Morthond (S. "Black root") was one of the seven rivers of Gondor.
Course
The Morthond arose in the White Mountains in a narrow valley that led to the southern entrance of the Paths of the Dead. The river rose beneath the sheer mountainsides of the White Mountains' southern extent, and flowed south-west for half its length before turning south-east to join the Ringló near Cobas Haven.
Near the confluence of the Morthond and the Ringló was the ancient Elf-haven of Edhellond. This refuge had been founded at the beginning of the Second Age by a remnant of Elves from Doriath.
At the time of the War of the Ring, the lord of the Blackroot Vale was Duinhir. He and his two sons, Duilin and Derufin, marched to Minas Tirith with five hundred bowmen to aid in the city's defence. On 8 March T.A. 3019 Aragorn, Gimli, Legolas, the Grey Company, and the Army of the Dead exited from the Paths of the Dead alongside the Morthond. They followed the young river before crossing a bridge on their way to the Stone of Erech.