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Mordor is the dwelling place of Sauron, in the southeast of Middle-earth to the East of Anduin, the great river. Frodo and Sam went there to destroy the One Ring. Mordor was unique because of the three enormous mountain ridges surrounding it, from the North, from the West and from the South, that protected this land from an unexpected invasion by any of the people living in those directions.

The southern part of Mordor, Núrn, was slighly more fertile, and moist enough to carry the inland sea of Núrnen. Nurn was made somewhat fertile because the ash blown from Mount Doom left its soil nutrient rich, thus allowing dry-land farming. Unfortunately, the inland sea of Núrn was salty, not freshwater.

Mordor was a relic of the devastating works of Morgoth, apparently formed by massive volcanic eruptions. It was given the name Mordor already before Sauron settled there, because of its volcano Orodruin and its eruptions. Sauron however was the first to settle there.