Map of Sapporo Subway in Japan
<a href="//commons.wikimedia.org/wiki/Special:Contributions/Hiro36" title="Special:Contributions/Hiro36">Hiro36</a>
CC BY 2.5
Image created by  <a href="//commons.wikimedia.org/wiki/Special:Contributions/Hiro36" title="Special:Contributions/Hiro36">Hiro36</a>.