is an abbreviation of Organization of the Petroleum Exporting Countries. Its member countries generate a big part of world's oil production. Organization is currently headquartered in Vienna and it consists of 14 members:
- Equatorial Guinea
- Republic of the Congo
- Saudi Arabia
- United Arab Emirates
consists of OPEC members and another 10 oil producing countries:
- South Sudan
Currently OPEC+ is a group of 24 members.