Board Thread:General Mod Discussion/@comment-29145474-20170217010507/@comment-25101089-20170217035736

But Rhûn is very large, and for the most part very sparsely populated. Yes, I agree that Sauron could find any hidden stronghold of powerful freEasterlings if he was really trying to, but I was thinking more of unimportant tribes who just went unnoticed. It doesn't seem too much of a stretch to posit that many tribes simply went unnoticed by him while he invested his efforts in more significant matters, especially so beyond the Orocarni and the Ered Gwaeren.