Ariana, the Latinized form of the Ancient Greek Ἀρ(ε)ιανή Ar(e)ianē (inhabitants: Ariani; Ἀρ(ε)ιανοί Ar(e)ianoi), was a general geographical term used by some Greek and Roman authors of the ancient period for a district of wide extent between Central Asia and the Indus River, comprehending the eastern provinces of the Achaemenid Empire that covered the whole country of modern day Afghanistan, and a few parts of India, Pakistan, Tajikistan, Iran, Turkmenistan, and Uzbekistan.