Map shows the distribution of ancient Greek dialects in around 400 BC, following Ernst Risch, <i>Museum Helveticum</i> (1955). <i>NW</i> means "North-Western Greek".
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<span class="int-own-work" lang="en">Own work</span>. Moved from <a href="https://en.wikipedia.org/wiki/en:Image:Greek_dialects.png" class="extiw" title="w:en:Image:Greek dialects.png">English Wikipedia</a>