In the context of a collaboration between the NIA-ERA project on ditched enclosures and the University of Kiel, the geophysics of Monte da Contenda enclosure was completed and published here. Another highly complex site with many enclosures, some of them using the stream as a border and having more than 400m long. And in the centre, another one of those patterned wavy enclosures, so typical of the Guadiana basin. This project of NIA-ERA has been giving a major contribution to change our knowledge about the Prehistoric landscape of Alentejo in empirical and theoretical terms. And to save some of these sites (or the knowledge about them) from the destruction in process due to intensive agriculture with the connivance (by absence and impotency) of the Portuguese State.