Former OPEC member states

Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania, between the Indian and Pacific oceans. Comprising over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea, Indonesia is the world's largest archipelagic state and the 14th-largest country by area, at . Indonesia has significant areas of wilderness that support one of the world's highest levels of biodiversity. It shares land borders with Papua New Guinea, Timor-Leste, and Malaysia, as well as maritime borders with seven other countries, including Australia, Singapore,

Angola, officially the Republic of Angola, is a country on the western coast of Southern Africa. It is the second-largest Portuguese-speaking (Lusophone) country after Brazil in both total area and population and is the seventh-largest country in Africa. It is bordered by Namibia to the south, the Democratic Republic of the Congo to the north, Zambia to the east, and the Atlantic Ocean to the west. Angola has an exclave province, the province of Cabinda, that borders the Republic of the Congo and the Democratic Republic of the Congo. The capital and most populous city is Luanda.

Ecuador, officially the Republic of Ecuador, is a country in northwestern South America, bordered by Colombia on the north, Peru on the east and south, and the Pacific Ocean on the west. It also includes the Galápagos Province which contains the Galápagos Islands in the Pacific, about west of the mainland. The country's capital is Quito and its largest city is Guayaquil.

Qatar, officially the State of Qatar, is a country in West Asia. It occupies the Qatar Peninsula on the northeastern coast of the Arabian Peninsula in the Middle East; it shares its sole land border with Saudi Arabia to the south, with the rest of its territory surrounded by the Persian Gulf. The Gulf of Bahrain, an inlet of the Persian Gulf, separates Qatar from nearby Bahrain. The capital is Doha, home to over 80% of the country's inhabitants. Most of the land area is made up of flat, low-lying desert.