According to the ''Oxford English Dictionary'' (third edition 2009), the name "India" is derived from the Classical Latin ''India'', a reference to South Asia and an uncertain region to its east; and in turn derived successively from: Hellenistic Greek ''India'' ('' Ἰνδία''); ancient Greek ''Indos'' ('' Ἰνδός''); Old Persian ''Hindush'', an eastern province of the Achaemenid empire; and ultimately its cognate, the Sanskrit ''Sindhu'', or "river," specifically the Indus River and, by implication, its well-settled southern basin. The ancient Greeks referred to the Indians as ''Indoi'' (''''), which translates as "The people of the Indus".