Busan (Korean pronunciation: [pu.san]), formerly known as Pusan and now officially Busan Metropolitan City, is South Korea’s second most-populous city after Seoul. It is the economic, cultural, and educational center of southeastern Korea, with its port—Korea’s busiest and the 10th-busiest in the world—only about 120 miles (190 km) from the Japanese islands of Honshu and Kyushu. Its surrounding “Southeast Economic Zone” (including Ulsan and South Gyeongsang) is now South Korea’s largest industrial area.
(Source: Wikipedia)