Western Armenia is the term used in referring to formerly Armenian-inhabited areas of the Armenian Highland, that were part of the Ottoman Empire since the 16th century and became part of the Republic of Turkey in 1923.
“Presently 90% of the Armenian cities, towns and buildings in Eastern Turkey (Western Armenia) have been Turkified.” – http://www.armeniaconsulatela.org/index.php?p=1&cat_id=103