Korean dialect zones according to <i>The National Atlas of Korea</i>
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<p><span class="int-own-work" lang="en">Own work</span>
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<ul><li>outline data from Natural Earth 10m</li>
<li><cite class="book" style="font-style:normal">National Geography Information Institute (2017)      <i> <a rel="nofollow" class="external text" href="http://nationalatlas.ngii.go.kr/us/index.php">The National Atlas of Korea</a></i>, <a href="https://en.wikipedia.org/wiki/en:Seoul" class="extiw" title="w:en:Seoul"><span title="capital of South Korea">Seoul</span></a>:  Ministry of Land Infrastructure and Transport, p. 37  <small></small></cite></li></ul>