Haiphong is one of the most important port cities in Vietnam; with the advantage of having a deep-water port, maritime transport there is very developed. Haiphong is also the third largest city in Vietnam. The name means “coastal defense”. Haiphong is also called “The City of the Red Flamboyant” because of the many flamboyant trees planted in the city. Haiphong is also famous for many festivals, of which Choi Trau Festival (Do Son Buffalo-fighting festival) in Do Son is unique.