Edoras was the capital of Rohan.
The city of Edoras was built on a hill in a valley of the White Mountains by Rohan's second King, Brego son of Eorl the Young. Before this, Rohan's capital was at Aldburg in the Folde.
Wulf son of Freca the Dunlending, invaded Rohan in 2758 and took Edoras usurping the throne in Meduseld. But the Long Winter, which had lasted five long months, ended and Fréaláf son of Hild came out of Dunharrow and with a small band of men, surprising Wulf, he attacked Edoras and slew Wulf. Regaining Edoras.
Edoras was Rohan's only real city, and held the Golden hall of Meduseld. It was here that Aragorn, Gimli, Legolas, and Gandalf the White met with Théoden King.
Edoras was built at the end of the valley of Harrowdale, which lay under the great mountain Starkhorn.
The river Snowbourn flowed past Edoras on its way west towards the Entwash.
In Peter Jackson's film version, Edoras was built on Mount Sunday, in the upper reaches of the Rangitata Valley, near Erewhon.