The Six Vilayets (Ottoman Turkish: ولايت سته, Vilâyat-ı Sitte), the Six Provinces, or the Six Armenian Vilayets (Armenian: Վեց Հայկական Վիլայեթները Vets' haykakan vilayet'nery; Turkish: Altı vilayet, Altı il) were the main Armenian-populated vilayets ("provinces") of the Ottoman Empire and, together, comprise most of Western Armenia. These were Van, Erzurum, Mamuret-ul-Aziz, Bitlis, Diyarbekir and Sivas.
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Six Vilayets in the context of Western Armenia
Western Armenia (Western Armenian: Արեւմտեան Հայաստան, Arevmdian Hayasdan) is a term to refer to the western parts of the Armenian highlands located within Turkey (formerly the Ottoman Empire) that comprise the historical homeland of the Armenians. Western Armenia, also referred to as Byzantine Armenia, emerged following the division of Greater Armenia between the Byzantine Empire (Western Armenia) and Sassanid Persia (Eastern Armenia) in AD 387.
The area was contested during the Ottoman–Persian Wars and was conquered by the Ottoman Empire during the wars of 1532–1555 and 1623–1639. The area then became known also as "Turkish Armenia" or "Ottoman Armenia", and included six vilayets. During the 19th century, the Russian Empire conquered sections of Western Armenia, including Kars.
View the full Wikipedia page for Western Armenia