Land of Seven Rivers
From Tolkien Gateway
A name for Ossiriand, and a literal translation of that Elvish name. The Land of the Seven Rivers lay between the River Gelion and the Blue Mountains, and was the home of the Green-elves, the Laiquendi. The Seven Rivers from which it took its name were the Gelion itself and six of its tributaries. From north to south, these tributaries were the Ascar, the Thalos, the Legolin, the Brilthor, the Duilwen and the Adurant.