Coordinates: 50°27’07,38" N 1°38’34,17" E
Slightly east of Le Bout De Haut
Also this a bit further south
Happy cakeday!
Could those be shallow pans to grow/collect sea salt?
They dont seem to hold water really or even be connected to water at all.
If you notice, the first picture in the post comment, shows the same location slightly zoomed out. There you may notice some larger areas that seem like ponds. But the smaller patches seem to be just cleared earth patches
Looking along that coastline, there are similar areas at other river mouths, including the Somme. I found this blog talking about manmade ponds for observation or hunting of waterfowl. Wonder if that’s what it is?
Peat bogs?
That is a good guess!
Never seen them done in circles like that. Only in (mostly) straight lines. But maybe they do it differently in France!