Overview Sai Gon (Ho-Chi-Minh City), Southern Vietnam Ho Chi Minh City is commonly known as Sai Gon or by the abbreviation HCMC. Although it is not the capital of Viet Nam, it is the largest city in Viet Nam and it was the capital of the former Republic of Vietnam (South Vietnam). Description Ho Chi Minh City is commonly known as Saigon or by the abbreviation HCMC. Although it is not the capital of Vietnam, it is the...