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Haradrim

Ered Mithrin

Vengeance of Mordor
He rode in the host of the Rohirrim, and fought for the Lord of Gondor by land and by sea; and then in the hour of victory he passed out of the knowledge of the Men of the West, and went alone far into the East and deep into the South, exploring the hearts of Men, both evil and good, and uncovering the plots and devices of the servants of Sauron.
The Lord of the Rings, Appendix A