 Karen Wynn Fonstad calculated Rohan to be 52,763 square miles (136,656 km²) in area (slightly larger than England).Rohan is bordered to the north by the Fangorn forest, home to the Ents (tree-giants) led by Treebeard, and by the great river Anduin, called Langflood by the Rohirrim.To the northeast are the walls of Emyn Muil.