While the article does not say which country the circle is located in, the image on the site shows a nearby river and perhaps the Med in the background.
Likely these were built by the pre-Egyptian dynasty “Libyans” who built similar Megalithic structures as far north as the UK (Stonehenge) - all close to water. Most of those date to around 3,500 BC or shortly after.
These same people are postulated to have been the builders of the Giza complex. However, proving it would mean digging down through hundreds of feet in the north and west of the Nile River Delta, the territory the “Libyans” or Westerners controlled at the time.
I think I read there are some examples of their writing, but there is no way to translate it yet.
Most archeologists would likely say they built most of these structures as a calendar, solar observation points, etc. However, these are just theories. Which may be akin to saying the Giza pyramids were built as Pharaohs tombs ... which are neither tombs nor built by ancient dynastic Egyptians.
The past is not only stranger than we think, but stranger than we can imagine ...
Open air prisons. Break the legs of convicts then throw them over the stone wall. They’ll starve or eat someone before they’re healed.
Even they enjoyed trout fishing......Not likely with Rapala's but the traditional hook and locust.......