The Association of Southeast Asian Nations (ASEAN) is founded by Indonesia, Malaysia, the Philippines, Singapore and Thailand.
ASEAN
The Association of Southeast Asian Nations, commonly abbreviated as ASEAN, is a regional grouping of 10 states in Southeast Asia "that aims to promote economic and security cooperation among its ten members." Together, its member states represent a population of more than 600 million people and land area of over 4.5 million km2 (1.7 million sq mi). The bloc generated a purchasing power parity (PPP) gross domestic product (GDP) of around US$10.2 trillion in 2022, constituting approximately 6.5% of global GDP (PPP). ASEAN member states include some of the fastest growing economies in the world, and the institution plays an integral role in East Asian regionalism.
Indonesia
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 1,904,569 square kilometres. With over 280 million people, Indonesia is the world's fourth-most-populous country and the most populous Muslim-majority country. Java, the world's most populous island, is home to more than half of the country's population.
Malaysia
Malaysia is a country in Southeast Asia. A federal constitutional monarchy, it consists of 13 states and three federal territories, separated by the South China Sea into two regions: Peninsular Malaysia on the Indochinese Peninsula and East Malaysia on the island of Borneo. Peninsular Malaysia shares land and maritime borders with Thailand, as well as maritime borders with Singapore, Vietnam, and Indonesia; East Malaysia shares land borders with Brunei and Indonesia, and a maritime border with the Philippines and Vietnam. Kuala Lumpur is the country's national capital, largest city, and the seat of the legislative branch of the federal government, while Putrajaya is the federal administrative capital, representing the seat of both the executive branch and the judicial branch of the federal government. With a population of over 34 million, it is the world's 42nd-most populous country.