Townships

Boyer Ahmad (Yasooj)
The township of Boyer Ahmad with its center as Yasooj (the center of province) is limited to the north by the city of Lordegan (of the Chahar Mahal va Bakhtiyari Province ), and Semirom(Esfahan Province), to the east is Eqleed, to the south is Sepeedan and Mamasani (Fars Province) and in the west it is limited to Kohkilouyeh.
This city is located in a cold region and has a cold winters and temperate summers. In this region snow and rainfall is plentiful and due to coverage of its summits and valleys by lots of snow, at all seasons of the year it has enough water. Yasooj is in a vast forested plain. Formerly, there was an old town there, named of Talkhosro, at a distance 6 km. from Yasooj and was a center of the Khans (tribal chiefs) of the time in Boyer Ahmad. After the years 1930 to 1944 new buildings were constructed in this part, but they were all ruined this after.


Gachsaran
Gachsaran is one of the most extreme sections of Kohkilouyeh va Boyer Ahmad Povince. This section was separated in 1959 from the township of Behbahan and came under the township of Kohkilouyeh and recently has been turned into a township. The petroleum region of Gachsaran is located in tropical part which has two kinds of dry and temperate weather. As a result of its oil fields it is one of the famous centers of petroleum exploitation and exploration, thus very important. Dogonbadan is the center of this township.


Kohkilouyeh (Dehdasht)
This township is limited in the north by Baq-e-Malek, Eazeh (Khuzestan Province) and Lordegan (Chahar Mahal va Bakhtiyari Province) and in the south by Gachsaran, in the west are the cities of Behbahan and Ramhormoz (Khuzestan Province) and in the northeast is Boyer Ahmad. This city has two kinds of climate that are quite different. A cold region and a tropical region provide winter-quarters for tribes. Sometimes in summer it is even cold in the summits of the mountains, whereas, warm weather prevails in the southern areas. This region has lots of mountains, where there are residential facilities.
Aryobarzan the Achaemenian commander in Takab a narrow pass of this region (in northeast of Behbahan) resisted against the army of Alexander the Macedonian. In a place called Tang-e-Sorook ancient constructions can be observed such as stone stairs and a statue, alongside a route related to the Sassanid period. The city of Dehdasht which is the center of Kohkilouyeh, in the past was one of the trading centers of Fars, Esfahan and Khuzestan provinces. In the Sassanid era, Qobad Sassani founded Arjan the present city of Behbahan, in the plain regions which was known as Qobad Khoreh. The mountainous regions were also called "Rome Zemigan".
In the post Islamic period Qobad Khoreh, was called Argan or Arjan and the mountainous region of "Rome Zemigan" was reputed as Kohkilouyeh. In later centuries when Arjan turned to ruins and was triumphed by the Afshar and Lors, most of this territory was called "Kohkiloyeh", its mountainous region "Posht Kooh" and its plain was called "Zir Kooh". Kohkilouyeh is one of the flourishing and developing townships of the province today.