Semarang is the capital and largest city of Central Java province in Indonesia. It has an area of 373.78 square kilometres (144.32 sq mi) and a population of approximately 1.8 million people, making it Indonesia's seventh most populous city after Jakarta, Surabaya, Bandung, Bekasi, Medan, and Tangerang. The built-up (metro) area had 3,183,516 inhabitants at the 2010 census spread on 2 cities and 26 districts. Greater Semarang (a.k.a. Kedungsapur) has a population of close to 6 million (see Greater Semarang section), and is located at 6°58′S 110°25′E. A major port during the Dutch colonial era, and still an important regional center and port today, the city has a dominant Javanese population.

Jakarta is the capital and largest city of Indonesia. Located on the northwest coast of the world's most populous island Java, it is the centre of economics, culture and politics of Indonesia, with a population of 10,075,310 as of 2014. Jakarta metropolitan area has an area of 6,392 square kilometers, which is known as Jabodetabek (an acronym of Jakarta, Bogor, Depok, Tangerang and Bekasi). It is the world's second largest urban agglomeration (after Tokyo) with a population of 30,214,303 as of 2010. Jakarta is predicted to reach 35.6 million people by 2030 to become the world's biggest megacity. Jakarta's business opportunities, as well as its potential to offer a higher standard of living, attract migrants from across the Indonesian archipelago, combining many communities and cultures.

Ko Samui is an island off the east coast of the Kra Isthmus, Thailand. Geographically in the Chumphon Archipelago, it is part of Surat Thani Province, though as of 2012, Ko Samui was granted municipal status and thus is now locally self-governing. Ko Samui is Thailand's second-largest island after Phuket, with an area of 228.7 km2, a population of over 63,000 and a hotel occupancy rate of 73 percent as the number of visitors continues to increase. Abundant tourist resources, sandy beaches, coral reefs, and coconut trees are present on the island.

Bangkok is the capital and most populous city of Thailand. It is known in Thai as Krung Thep Maha Nakhon or simply Krung Thep. The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in central Thailand, and has a population of over eight million, or 12.6 percent of the country's population. Over fourteen million people (22.2 percent) lived within the surrounding Bangkok Metropolitan Region at the 2010 census, making Bangkok the nation's primate city, significantly dwarfing Thailand's other urban centres in terms of importance.

Bangkok is the capital and most populous city of Thailand. It is known in Thai as Krung Thep Maha Nakhon or simply Krung Thep. The city occupies 1,568.7 square kilometres (605.7 sq mi) in the Chao Phraya River delta in central Thailand, and has a population of over eight million, or 12.6 percent of the country's population. Over fourteen million people (22.2 percent) lived within the surrounding Bangkok Metropolitan Region at the 2010 census, making Bangkok the nation's primate city, significantly dwarfing Thailand's other urban centres in terms of importance.

Ho Chi Minh City, also known by its former name of Saigon is the most populous city in Vietnam with a population of 8.4 million (13 million in the metropolitan area) as of 2017. Located in southeast Vietnam, the metropolis surrounds the Saigon River and covers about 2,061 square kilometres (796 square miles).

Under the name Saigon, it was the capital of French Indochina from 1887 to 1902 and again from 1945 to 1954. Saigon would later become the capital of South Vietnam from 1955 until its fall in 1975. On 2 July 1976, Saigon merged with the surrounding Gia Định Province and was officially renamed Ho Chi Minh City after revolutionary leader Hồ Chí Minh (although the name Sài Gòn is still widely used).

Ho Chi Minh City is the financial centre of Vietnam and is classifed as a Beta+ World City by Globalization and World Cities Research Network. It is home to the Ho Chi Minh City Stock Exchange, the largest stock exchange by total market capitalization in Vietnam and the headquarters of many national and international banks and companies.

Ho Chi Minh City is the most visited city in Vietnam, with 6.3 million visitors in 2017. Many of the city's landmarks which are well known to international visitors include the Bến Thành Market, Ho Chi Minh City Hall, Notre-Dame Cathedral Basilica of Saigon, Independence Palace and the Municipal Theatre. The main passenger airport serving the metropolitan area is Tan Son Nhat International Airport, it is the busiest airport in Vietnam handling 36 million passengers in 2017.

Da Nang is the fifth largest city in Vietnam after Ho Chi Minh City, Hanoi, Haiphong and Can Tho in terms of urbanization and economy. Located on the coast of the South China Sea at the mouth of the Han River, it is one of Vietnam's most important port cities. As one of the country's five direct-controlled municipalities, it is under the direct administration of the central government.

Da Nang is the commercial and educational centre of Central Vietnam, as well as being the largest city in the region. In addition to its well-sheltered, easily accessible port, Da Nang's location on the path of National Route 1A and the North–South Railway makes it a hub for transportation. It is located within 100 km (62 mi) of several UNESCO World Heritage Sites, including the Imperial City of Hue, the Old Town of Hoi An, and the My Son ruins. The city was previously known as Cửa Hàn during early Đại Việt settlement, and as Tourane (or Turon) during French colonial rule. Before 1997, the city was part of Quang Nam-Da Nang Province.

On 1 January 1997, Da Nang was separated from Quảng Nam Province to become one of four independent (centrally controlled) municipalities in Vietnam. Da Nang is listed as a first class city, and has a higher urbanization ratio than any of Vietnam's other provinces or centrally governed cities.