The Mannish name for the narrow pass in northwestern Mordor called Carach Angren in Elvish. Both names have the same meaning: the Iron Jaws. The Isenmouthe lay some thirty miles southeast of the Morannon, and led from the valley of Udûn into the wide and desolate lands of the Plateau of Gorgoroth. This pass formed part of the inner defences of Mordor, and Sauron had built a rampart and a ditch across the opening to repel any invaders who might breach the Black Gate of his land.
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