North Khorasan; Razavi Khorasan; South Khorasan.[3] Khuzestan Ahvaz 64,055 km2 (24,732 sq mi) 4,710,509 67.8/km2 (176/sq mi) 18 71.3 73.9 Kohgiluyeh and Boyer-Ahmad Yasuj 15,504 km2 (5,986 sq mi) 713,052 42.5/km2 (110/sq mi) 5 71.2 73.1 Originally part of Khuzestan province.