The reason why it is Chungcheongbuk-do and Chungcheongnam-do and not Chungcheongjwa-do and Chungcheong-udo
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If you look at the map, Chungcheong-do is east to west.
Surprisingly, Chungjwa and Chungwoo were correct until the Joseon Dynasty!
However, in 1896, Chungcheongnam-do became Chungcheongbuk-do by official law.
