[Adder]

"Many of these circles sit near seasonal streams and plug into networks of ancient field walls and enclosures. Some stand close to dolmens, the old stone burial chambers. That pattern suggests the builders were marking territory, managing livestock, gathering for ceremonies, or simply organizing communal space."

That's a lot of work to allocate garden plots and corrals. But an interesting story.

[PAR35]

Looks like a fortification to me - concentric defensive rings with offset gaps so that each one faces a solid defensive barrier.

Or else a maze for a pre-historic theme park.

[posterchild]

An early version of: https://www.theedkins.co.uk/jo/maze/chartres/index.htm ?

[jimtorr]

.....near seasonal streams and plug into networks of ancient field walls and enclosures.

Maybe reservoirs to capture seasonal water?