… found in the context of Alqueva water supply network. Here you can see how difficult it can be, sometimes, to detect a negative structure of this type: a darker spot, with some charcoals, a fragment of a Pecten maximus shell, corresponds to the filling of a ditch crossed by the trench open to receive the water tube.
It is, again, located in the Sado basin, in a peripheral zone to the concentration of ditched enclosures in Alentejo. They are slowly appearing in more western areas in the region. I have to update the enclosures map.