Most populous of Libya's three historic regions, situated in the northwestern part of the country. Name derived from Tripolis (Three Cities).

Tripolitania or Tripolitana (Arabic: طرابلس, transliterated: Tarābulus) is a historic region and an ex Province or State ("muhafazah" or "wilayah") of Libya (alongside Cyrenaica and Fezzan http://www.zum.de/whkmla/histatlas/northafrica/libya19431951.gif), in an old system of administrative divisions which was abolished in the early 1970s in favour of a system of smaller-size municipality or "baladiyat" singular "baladiyah") . The "Baladiyat"-system was subsequently changed many times and has lately become "Sha'biyat"-system. What used to be Tripolitania in the old system became divided up into several "Baladiyat" or "Sha'biyat", see administrative divisions in Libya.