Southeastern Maritime Industrial Region
The Busan-Ulsan Metropolitan Area, centered on the harbor cities of Busan and Ulsan, is the Republic of Korea's second-largest metropolitan area in terms of population and is the country's second-most developed region as well. It is also an industrial region for shipbuilding, international trade, and heavy industries, such as car making and chemical production.
Source: Wikipedia — Southeastern Maritime Industrial Region (CC BY-SA 4.0)