Mordor (Sindarin: Black Land, Quenya: Land of Shadow) is located in South East Middle Earth to the east of the River Anduin.
Orcish is the native tounge. Strangely similar to English.
Mordor is surrounded on three sides by large mountain ranges: Ered Lithui (Ash Mountains) in the the north, Ephel Duath (Mountains of Shadow) to the west bordering the region of Gondor, and extending round to the south. Generally they are not very nice.
Trekking through these mountains should not be taken lightly. An authorised, experienced guide is recommended. One agency in particular seems to have some success: precioussestours.com, but they do demand payment in gold rings and the lead guide can be a touch moody.
One does not simply walk in to Mordor. You gotta ROCK in to Mordor. Or take the shortbus.
Do not sleep in Mordor.