Dark Land

Sauron's domain of Mordor.
An occasional name used for Sauron's fortified country of Mordor. In fact 'Dark Land' is a possible interpretation of the name Mordor, though the alternative 'Black Land' is used much more frequently.
On at least one early map of Arda, a great southern continent appears labelled 'Dark Land'. This region is not otherwise mentioned, and is unrelated to the Dark Land mentioned in The Lord of the Rings.