Illustration of Christaller's <a href="https://en.wikipedia.org/wiki/central_place_theory" class="extiw" title="w:central place theory">central place theory</a>.
<a href="//commons.wikimedia.org/w/index.php?title=User:Avenafatua&amp;action=edit&amp;redlink=1" class="new" title="User:Avenafatua (page does not exist)">Avenafatua</a>
2007-05-21
<span class="int-own-work" lang="en">Own work</span>