This painting shows the lock at Flatford Mill, on the River Stour in Suffolk
<bdi><a href="https://en.wikipedia.org/wiki/en:John_Constable" class="extiw" title="w:en:John Constable"><span title="English painter (1776-1837)">John Constable</span></a>
</bdi>
1824<div style="display: none;">date QS:P571,+1824-00-00T00:00:00Z/9</div>
1. <a rel="nofollow" class="external text" href="http://www.allartpainting.com/a-boat-passing-a-lock-p-2399.html">allartpainting.com</a><br>2. <a href="https://en.wikipedia.org/wiki/Christie%27s" class="extiw" title="en:Christie's">Christie's</a>, LotFinder:  entry  <a rel="nofollow" class="external text" href="https://www.christies.com/LotFinder/lot_details.aspx?intObjectID=5584815">5584815</a>