Busan, officially Busan Metropolitan City, is South Korea's second most populous city after Seoul, with a population of over 3.3 million inhabitants as of 2024. Formerly romanized as Pusan, it is the economic, cultural and educational center of southeastern South Korea, with its port being South Korea's busiest and the sixth-busiest in the world. The surrounding "Southeastern Maritime Industrial Region" is South Korea's largest industrial area.