Persia is a historic region of southwestern Asia associated with the area that is now modern Iran. The term Persia was used for centuries and originated from a region of southern Iran formerly known as Persis, alternatively as Pārs or Parsa, modern Fārs. The use of the name was gradually extended by the ancient Greeks and other peoples to apply to the whole Iranian plateau. The people of that region have traditionally called their country Iran, “Land of the Aryans.” That name was officially adopted in 1935. Today, Iran is the country that was once known as Persia.