A wilayah (ولاية in Arabic) or velâyat (ولایت in Persian), vilayet in Turkish or ولایت in Urdu), is an administrative division, usually translated as "province", or occasionally as "governorate". The word comes from the Arabic "w-l-y", "to govern": a wāli—"governor"—governs a wilayah, "that which is governed". Under the Caliphate, the term referred to any constituent near-sovereign state.

More information on the Wikipedia page [1].