Description. The borders of Rohan were 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; the river Anduin and the west-cliff of the Emyn Muil hills down to …