Iran's Mellat Bank started offering bonds worth 250 million euro on Monday at its branches abroad.
The plan is considered the fourth stage of offering a total of one billion euro in bonds designed to help finance development of phases 15-18 of Iran's South Pars natural gas field, IRNA News Agency reported.
The South Pars gas field is located on the Persian Gulf. It is the world's largest gas field, shared between Iran and Qatar.
According to International Energy Agency, the field holds an estimated 50.97 trillion cubic meters (1800 trillion cubic feet) of in-situ gas and some 50 billion barrels of condensates.