that this area was also populated with some British residents who owned houses and vast lands not far from the outskirts of the city.

[2] Gachsaran County's population history and administrative structure over three consecutive censuses are shown in the following table.

Gachsaran is an oil- and gas-producing area that has just started to expand and profits from its industrial capacity.

The main wells have been drilled at reservoirs of Gach Saran, Bibi Hakimeh, Rag-e-Safid, Pazanan, Gulkhari, Binak, Chilingar, Nargesi, Garangan, Kilur Karim, Sulabedar, Siahmakan, Khaviz, Rudak, Zaaeh, Chahr Bisheh and Kuh-e-kaki.

Out of these regions Gachsaran Reservoir with 500,000 bd and Siahmakan with 4000bd have the highest and lowest production rates respectively.