Rohan
Rohan is a Mannish kingdom on the northern borders of Gondor. It is the territory of the Rohirrim, a people of herdsmen and farmers. Well-known for their horses and cavalry, they are Gondor's most important ally.
Description
The borders of Rohan are the river Isen from its junction with the river Adorn and then northwards to the outer walls of Isengard and the river Adorn in the west; from the outer walls of Isengard eastwards and northwards along the eaves of Fangorn Forest to the river Limlight in the north; and the river Anduin and the west-cliff of the Emyn Muil hills down to the marshes of the mouths of the river Entwash and the Mering Stream in the east. The White Mountains are its southern border.
The most significant feature of Rohan's geography is the river Entwash, which marks the border between the Eastemnet and Wold and the rest of the kingdom. Other lands were the Westemnet, Westfold, the Folde and Eastfold. The Adorn region to the west of the White Mountains is nominally under Rohan's control, but its people have a great deal of Dunlending blood and remain mostly independent.
The Rohirrim found abandoned Gondorian fortresses and refuges in the White Mountains, such as Aldburg and the Hornburg which they restored and used themselves.
The capital of Rohan is the hill fort of Edoras which lies on the slopes of the White Mountains. Another large settlement is Aldburg, which was the first capital after the Steward Cirion granted the land to the Rohirrim.
Rohan is roughly a third the size of Gondor, whose borders have slowly been shrinking for decades.