 To the west are the rivers Adorn and Isen, where Rohan borders the land of the Dunlendings.To the northwest, just under the southern end of the Misty Mountains, lies the walled circle of Isengard around the ancient tower of Orthanc; at the time of the War of the Ring, it had been taken over by the evil wizard Saruman.The area of the western border where the Misty Mountains and the White Mountains drew near to each other is known as the Gap of Rohan.