<a href="https://en.wikipedia.org/wiki/Safe_water_mark" class="extiw" title="en:Safe water mark">Safe water mark</a> in <a href="https://en.wikipedia.org/wiki/IALA" class="extiw" title="en:IALA">IALA</a> system.
No machine-readable author provided. <a href="//commons.wikimedia.org/w/index.php?title=User:Pbz~commonswiki&amp;action=edit&amp;redlink=1" class="new" title="User:Pbz~commonswiki (page does not exist)">Pbz~commonswiki</a> assumed (based on copyright claims).
No machine-readable source provided. Own work assumed (based on copyright claims).