United Armenia (classical , reformed: Միացյալ Հայաստան, Miatsyal Hayastan), also known as Greater Armenia or Great Armenia, is an Armenian nationalist and irredentist concept referring to areas within the traditional Armenian homeland—the Armenian Highland—which are currently or have historically been mostly populated by Armenians. The idea of what Armenians see as unification of their historical lands was prevalent throughout the 20th century and has been advocated by individuals, various organizations and institutions, including the nationalist parties Armenian Revolutionary Federation (ARF or Dashnaktsutyun) and Heritage, the underground paramilitary ASALA and others.