Buddhist states

Cambodia, officially the Kingdom of Cambodia, is a country in Mainland Southeast Asia. It is bordered by Thailand to the northwest, Laos to the north, and Vietnam to the east, and has a coastline along the Gulf of Thailand in the southwest. It spans an area of , dominated by a low-lying plain and the confluence of the Mekong river and Tonlé Sap, Southeast Asia's largest lake. It is dominated by a tropical climate. Cambodia has a population of about 17 million people, the majority of which are ethnically Khmer. Its capital and most populous city is Phnom Penh, followed by Siem Reap and Battamba

Myanmar, officially the Republic of the Union of Myanmar and also referred to as Burma (the official English name until 1989), is a country in northwest Southeast Asia. It is the largest country by area in Mainland Southeast Asia and has a population of about 55 million. It is bordered by India and Bangladesh to the northwest, China to the northeast, Laos and Thailand to the east and southeast, and the Andaman Sea and the Bay of Bengal to the south and southwest. The country's capital city is Naypyidaw, while its largest city is Yangon (formerly Rangoon).

Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, formerly known as Ceylon, is an island country in South Asia. It is located in the Indian Ocean, southwest of the Bay of Bengal, and is separated from India by the Gulf of Mannar and the Palk Strait. Sri Lanka shares a maritime border with the Maldives to the southwest and India to the northwest, and lies across the Bay of Bengal from Bangladesh and Myanmar to the northeast and the Andaman and Nicobar Islands of India to the east. Its capital is Sri Jayawardenepura Kotte, while Colombo is its largest city and the political, financial and cultural centre. Sri Lanka's population is 22 million; with the Sinhalese people, who speak the Sinhala language, forming the vast majority—while Tamil is spoken by the large Tamil minority. Other long-established ethnic groups include the Moors, Indian Tamils, Burghers, Malays, Chinese, and Vedda.

Bhutan, officially the Kingdom of Bhutan, is a landlocked country in South Asia, located in the Eastern Himalayas, bordering China to the north and northwest and India to the south and southeast. With a population of over 727,145 and a territory of , Bhutan ranks 133rd in land area and 160th in population. It is a democratic constitutional monarchy with a King as the head of state and a prime minister as the head of government. The Je Khenpo is the head of the state religion, Vajrayana Buddhism.