Wilderland.

Wilderland in Near Eastern Middle-Earth. ( See Endor / Arda ) There is no clear explanation or definition of Wilderland, its borders or the size of it but from the Hobbit and the maps provided with the book it seems like Wilderland was the area East of Hithaeglir, the vales of Anduin down to Gladden River and South of Ered Mithrin including Erebor, Dale and Mirkwood down to the East Bight and the Narrows of the Forest plus a part of the plains South of river Celduin. South-East of Wilderland was the area and plains of Rhovanion.