Administrative map of the Kingdom of Bulgaria (1941-44) showing Oblasts and Okolii. Source data:  Deutsche Heereskarten (Bulgarien 100k, Karte von Mitteleuropa 300k, General Karte 200k). Karta na Bulgaria (1927). Source map data from <a rel="nofollow" class="external text" href="http://www.mapywig.org">Mapywig</a> and <a href="//commons.wikimedia.org/wiki/User:%D0%9F%D0%B0%D0%BA%D0%BA%D0%BE" title="User:Пакко">User:Пакко</a>.
<a href="//commons.wikimedia.org/wiki/User:XrysD" title="User:XrysD">XrysD</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>