Paris 4th district (France), metro (subway) lines and RER
<a href="//commons.wikimedia.org/wiki/User:Hmaglione10" title="User:Hmaglione10">Hmaglione10</a>
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/File:Metro_y_rer_4er_arrodisement.png" class="mw-redirect" title="File:Metro y rer 4er arrodisement.png">File:Metro_y_rer_4er_arrodisement.png</a>