Investigation sites in 2019-2021.

1. Jeollanam-do (with Gwangju Metropolitan City).

2. Jeollabuk-do.

3. Chungcheongnam-do (with Dajeon Metropolitan City and Sejong Special Self-Governing City).

4. Chungcheongbuk-do.

5. Gyeongsangnam-do (with Busan Metropolitan City and Ulan Metropolitan City).

6. Gyeongsanbuk-do (with Daegu Metropolitan City).

7. Gyeonggi-do (with Seoul Metropolitan Government and Incheon Metropolitan City).

8. Gangwon-do.