Fars territory or Ancient Persia in the southern part of Iran leading to the Persian Gulf, which has historical, continental, cultural and especially dialectal commonalities and includes the provinces of Khuzestan, Fars, Esfahan, Bushehr, Kohgiluyeh and Boyer-Ahmad, Hormozgan and Chaharmahal and Bakhtiari and the western part of Kerman Province, which is known as the origin of Persian language and inherited from Middle Persian. Wikipedia