The eastern hills was a spur of hills described in relation to the Ephel Dúath. It was either in the southwest of Mordor coming out from the Ephel Duath, or it was in the north-east of the Plateau of Gorgoroth, coming out from the Ered Lithui. The term could also be referring to both spurs. Sometime after Shelob made her lair in the Pass of Cirith Ungol, she mated with her many miserable offspring before devouring them, bringing forth "lesser broods" of spiders that "spread from glen to glen, from the Ephel Dúath to the eastern hills" and eventually spreading as far north as Dol Guldur and Mirkwood.