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Most of this area used to be marsh with open water. It was mostly diked and "de-watered" during the Mussolini period.
The beach at Arborea, near where I stayed Arborea itself is quite new, for Sardinia, It was built in the 1920's after the marshes were drained, as a farming town.
On the way to Tharros, I spotted this village at an agriturismo. I'm not sure what it represents. Their website doesn't say...
I saw a sign for a castle, as I went down the freeway, so I pulled off and found my way to a very narrow road that approached it. There were several other buildings. I didn't get to the castle itself, but I got some pictures of it.