Singapore, officially the Republic of Singapore, is a city-state and island country in Southeast Asia. It consists of one main island, 63 smaller islands and islets, and one outlying islet. Located just north of the equator, it sits at the southern tip of the Malay Peninsula, bordered by the Strait of Malacca to the west, the Singapore Strait and Indonesia’s Riau Islands to the south, the South China Sea to the east, and Malaysia’s Johor State to the north.

Indonesia, officially the Republic of Indonesia, is a Southeast Asian and Oceanian country located between the Indian and Pacific Oceans. It is the world’s largest archipelagic state, comprising over 17,000 islands—including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea. Covering 1.9 million square kilometers, it is the 14th-largest country by area. With over 280 million people, Indonesia is the fourth-most-populous country and the largest Muslim-majority nation. Java, the world’s most populous island, is home to more than half of the population.

Vietnam, officially the Socialist Republic of Vietnam, is located on the eastern edge of mainland Southeast Asia. It spans about 331,000 square kilometers and has a population of over 100 million, making it the 15th most populous country in the world. One of Southeast Asia’s two communist states, Vietnam shares land borders with China, Laos, and Cambodia, and maritime borders with Thailand, the Philippines, Indonesia, and Malaysia. Hanoi is the capital, while Ho Chi Minh City is the largest city.

Malaysia is a Southeast Asian country and a federal constitutional monarchy made up of 13 states and three federal territories. It is divided by the South China Sea into two regions: Peninsular Malaysia and East Malaysia on Borneo. Peninsular Malaysia borders Thailand and shares maritime boundaries with Singapore, Vietnam, and Indonesia, while East Malaysia shares land borders with Brunei and Indonesia, and maritime borders with the Philippines and Vietnam. Kuala Lumpur is the national capital and largest city, while Putrajaya serves as the administrative center. Malaysia has a population of over 34 million, making it the 42nd most populous country in the world.

Cambodia is a Southeast Asian nation located on the southern portion of the Indochinese Peninsula. It is a constitutional monarchy composed of 25 provinces and is bordered by Thailand to the northwest, Laos to the northeast, Vietnam to the east and southeast, and the Gulf of Thailand to the southwest.

Phnom Penh is the capital and largest city, serving as the country’s political, economic, and cultural center. Cambodia has a population of over 17 million people, placing it among the mid-sized nations in Southeast Asia. The country is best known for its rich history shaped by the Khmer Empire, whose legacy is most famously represented by Angkor Wat, as well as for its vibrant culture, agricultural economy, and rapidly developing urban centers.

Tokyo, the capital of Japan, is one of the world’s most dynamic and influential metropolitan areas. Located on the eastern coast of Honshu along Tokyo Bay, it serves as Japan’s political, economic, and cultural center. Tokyo is part of the Kantō region and sits at the heart of an extensive urban sprawl that includes neighboring prefectures such as Kanagawa, Chiba, and Saitama.

Administratively, Tokyo is unique: it functions as a metropolis composed of 23 special wards, multiple cities, towns, and villages, rather than a single traditional city. It is home to the seat of the Japanese government, the Imperial Palace, and major national institutions. With a population exceeding 14 million in the metropolitan prefecture—and over 37 million in the greater metropolitan area—Tokyo is the most populous urban area in the world.

Renowned for seamlessly blending tradition and modernity, Tokyo offers ancient temples and shrines alongside cutting-edge architecture, high-tech infrastructure, and efficient public transport. As a global hub for finance, innovation, fashion, cuisine, and pop culture, Tokyo plays a vital role not only in Japan but also on the international stage.

The Philippines, officially the Republic of the Philippines, is an archipelagic country in Southeast Asia, located in the western Pacific Ocean. It comprises 7,641 islands grouped into three main regions: Luzon, Visayas, and Mindanao. Covering around 300,000 square kilometers and with a population of over 110 million, it ranks as the 12th most populous country in the world.