'Despite America's sanctions... Iranian workers have found an oil field with 53 billion barrels of reserves,' Rouhani said in a speech in the central city of Yazd.
Iran has discovered a new oilfield with 53 billion barrels of oil in the southwest of the country, President Hassan Rouhani said on Sunday, news agency Reuters reported.
"Despite America's sanctions... Iranian workers have found an oil field with 53 billion barrels of reserves," Rouhani was quoted as saying by Reuters.
According to a report, the latest find would increase Iran's proven reserves by about a third.
The field covers 2,400 square kilometres (926 square miles) and is located in Iran's southwestern province of Khuzestan, Rouhani said in a speech aired on state TV.
Tensions between Iran and the United States have soared since President Donald Trump pulled out of a 2015 international deal that was meant to lift sanctions in exchange for a commitment from Tehran that it would cease trying to develop nuclear weapons.
The United States, France, Germany, Britain, and Saudi Arabia have all, to varying degrees, blamed Iran for the brazen September 14 airstrikes on the kingdom's Abqaiq plant and Khurais oil field.
Earlier this week, the United States imposed sanctions on nine people with ties to Iran's Supreme Leader Ayatollah Ali Khamenei, including his chief of staff, one of his sons and the head of Iran's judiciary.
The United States also sanctioned Iran's Armed Forces General Staff, the department said in the statement, which came 40 years after Iran seized the US embassy in Tehran, taking more than 50 Americans hostage.