<a href="https://en.wikipedia.org/wiki/Karl_Johanslussen" class="extiw" title="en:Karl Johanslussen">Karl Johanslussen</a> ("Lock of Charles John") is a lock and a sluice, connecting and controlling the flood discharge between Riddarfjärden, the easternmost part of Lake Mälaren, and Saltsjön, the section of the Baltic Sea reaching into central Stockholm, Sweden.
<a href="//commons.wikimedia.org/wiki/User:ArildV" title="User:ArildV">Arild Vågen</a>
<span class="int-own-work" lang="en">Own work</span>