Path of the rail tunnel project (dotted line) in the <a href="https://en.wikipedia.org/wiki/Marmaray" class="extiw" title="en:Marmaray">en:Marmaray</a> railway, across the Bosphorus strait.
<a href="//commons.wikimedia.org/wiki/User:S%C3%A9mhur" title="User:Sémhur">Sémhur</a>
CC BY-SA 4.0
<p><span class="int-own-work" lang="en">Own work</span>, from :
</p>
<ul><li><a href="//commons.wikimedia.org/wiki/File:Istambul_and_Bosporus_big.jpg" class="mw-redirect" title="File:Istambul and Bosporus big.jpg">Image:Istambul and Bosporus big.jpg</a> by the NASA Earth Observatory, uploaded on Commons by <a href="//commons.wikimedia.org/w/index.php?title=User:Dubaduba&amp;action=edit&amp;redlink=1" class="new" title="User:Dubaduba (page does not exist)">Dubaduba</a> under license PD (Public Domain) NASA</li>
<li><a href="//commons.wikimedia.org/wiki/File:Istanbul_Rapid_Transit_Map_(including_future_projects).png" title="File:Istanbul Rapid Transit Map (including future projects).png">Image:Istanbul Rapid Transit Map (including future projects).png</a> by Maximilian Dörrbecker (<a href="//commons.wikimedia.org/wiki/User:Chumwa" title="User:Chumwa">Chumwa</a>) under license CC-BY-SA-2.5</li></ul>