The water way <a href="https://en.wikipedia.org/wiki/Rotterdam" class="extiw" title="en:Rotterdam">Rotterdam</a>-<a href="https://en.wikipedia.org/wiki/Constan%C5%A3a" class="extiw" title="en:Constanţa">Constanţa</a> - from 1992 the shortest way for ships between the <a href="https://en.wikipedia.org/wiki/North_Sea" class="extiw" title="en:North Sea">North Sea</a> and the <a href="https://en.wikipedia.org/wiki/Black_Sea" class="extiw" title="en:Black Sea">Black Sea</a> (labelled in Esperanto)
<a href="//commons.wikimedia.org/wiki/User:Olahus" title="User:Olahus">Olahus</a>
2008
the corresponding wikicommons file in German