The Gap of Rohan is the opening between the mountain ranges of the Misty Mountains and the White Mountains (Ered Nimrais).Through the Gap of Rohan flowed the rivers Isen and Adorn, which formed the effective boundary of the Kingdom of Rohan. Rohan was formerly known as Calenardhon, and thus the Gap was then known as the Gap of Calenardhon. The triangle between the Isen and Adorn rivers and the White Mountains was a contested area between the Rohirrim and the Dunlendings.
