Keskimääräinen GPS-koordinaatit postinumero 357-921: 36.881, 126.296

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Listatut kaupungit:
>> Iwon-myeon/이원면 357-921, Chungcheongnam-do/충남, Taean-gun/태안군, Dangsanri/관1리, GPS-koordinaatit: 36.88113,126.29563
>> Iwon-myeon/이원면 357-921, Chungcheongnam-do/충남, Taean-gun/태안군, Gwan ri 1/관2리, GPS-koordinaatit: 36.88109,126.29559
>> Iwon-myeon/이원면 357-921, Chungcheongnam-do/충남, Taean-gun/태안군, Gwan ri 2/관리, GPS-koordinaatit: 36.88111,126.29561
>> Iwon-myeon/이원면 357-921, Chungcheongnam-do/충남, Taean-gun/태안군, Gwanri/당산리, GPS-koordinaatit: 36.88116,126.29566