This circular enclosure has a diameter of about 40 metres. The remaining walls have an height that varies from 1 metre to 1.80 metres, and a thickness of about 3 metres. In the inner area there are three accesses to interconnected underground galleries.
The galleries have a length from 1 to 5 metres and a height of about 1.50 metres.
In the centre of the enclosure some stones outline what were huts or other buildings.
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