| − | The '''Gap of Rohan''', formerly known as the '''Gap of Calenardhon''', is the opening between the mountain ranges of the [[Misty Mountains]] to the north and the [[Ered Nimrais|White Mountains]] to the south. Across the Gap flowed the river Isen. On each side of the Gap lay a fortress, [[Isengard]] to the north and [[Helm's Deep]] to the south. The Gap lay west of the land of [[Rohan (Middle-earth)|Rohan]], formerly [[Calenardhon]], after which the Gap was named. | + | The '''Gap of Rohan''', formerly known as the '''Gap of Calenardhon''', is the opening between the mountain ranges of the [[Misty Mountains]] to the north and the [[Ered Nimrais|White Mountains]] to the south. Across the Gap flowed the river Isen. On each side of the Gap lay a fortress, [[Isengard]] to the north and the [[Helm's Deep|Hornburg]] to the south. The Gap lay west of the land of [[Rohan (Middle-earth)|Rohan]], formerly [[Calenardhon]], after which the Gap was named. |