Rohan is a realm in J.R.R. Tolkien's Middle Earth. It plays a significant role in The Lord of the Rings. Cities inside Rohan include Edoras, Helm's Deep, Dunharrow and Snowbourne. Rohan borders Gondor to the south, and Isengard to the west. Rohan has an alliance with Gondor, in which they will come to each other's aid if the beakens are ever lit.