Cambodia also Kampuchea , officially the Kingdom of Cambodia, is a country located in the southern portion of the Indochinese peninsula in Southeast Asia. It is 181,035 square kilometres (69,898 square miles) in area

Da Nang is a centrally-run city, located in the South Central Coast region of Vietnam, and is the largest and central city in the Central-Central Highlands region.

Ha Long is the capital city of Quang Ninh province, Vietnam.

Hanoi is the capital of the Socialist Republic of Vietnam, and was also the capital of most of the feudal dynasties in Vietnam before.

Ho Chi Minh City (also known as Saigon) is the largest city in Vietnam in terms of population and size of urbanization. 

Hội An , formerly known as Fai-Fo or Faifoo, is a city with a population of approximately 120,000 in Vietnam's Quảng Nam Province and noted since 1999 as a UNESCO World Heritage Site.

Hue is a city directly under Thua Thien Hue province, Vietnam.

Thailand, formerly known as Siam,and officially the Kingdom of Thailand, is a country in Southeast Asia. It is located at the centre of the Indochinese Peninsula, spanning 513,120 square kilometres (198,120 sq mi)

Vietnam, officially the Socialist Republic of Vietnam

Vĩnh Long is a province located in the Mekong Delta of southern Vietnam. Its capital is Vĩnh Long. Its population is 1,046,390 and its area is 1,475 square kilometres (570 sq mi)