Busan–Gyeongnam Area, also known as Pusan–Kyŏngnam (PK) is the metropolitan area of Busan, Ulsan, and Gyeongsangnam-do (Gyeongnam) located in southeast South Korea. Now it is called Buulgyeong.
History
Until 1963, before Busan become a "Directly Governed City", the whole area formed the Gyeongsangnam-do. ==Economy==