According to the government run IRNA news agency, the Iranian Oil Ministry announced that 300,000 barrels are produced in the oil fields west of the Karun River per day.
Iraq and Iran have been ranked as the second and third largest producers of oil in the Organisation of the Petroleum Exporting Countries (OPEC).
Five Iraqi oil fields are located on the border with Iran, while the two countries share five other fields, it is estimated that they hold some 95 billion barrels of crude oil.
Source: www.middleeastmonitor.com/20180611-iran-earns-5bn-annually-from-joint-oil-fields-with-iraq/