great northern peninsula

Rhûn the Great was the name given to the great and unknown eastern lands of Middle-Earth by the Free Peoples of the Westlands. Rhûn the great, as a subcontinent, included the far plains of Palisor or Central Middle-earth, the great Northern Peninsula, the Lands of the Dawn in the Farthest East,the Great Plateau and the Southeastlands with Nikkea, Balizarand the Shelf-lands.

Sources: MERP