Enclosures and megaliths, built and used in the same historical and social context, share cosmological principles expressed in their orientations and in the ritualised practices they served as a stage.

This is particularly evident in how the visibility of the natural amphitheatre of Perdigões relates to this meaningful landscape of sacredness.

Of the various existing monuments, this route takes you to visit eight dolmens (Olival da Pega 1 and 2; Cebolinhos 1, 2 and 3; Comenda 1 and 2; Vale Carneiro), four menhirs/stelae (Monte da Ribeira, Barrocal, Bolhôa and Outeiro) and a cromlech (Xerez). It also leads you along the left bank of this great river and through Spanish territory to another large ditched enclosure (San Blás) partially submerged by the Alqueva dam, a site we know had links with Perdigões during the Copper Age. The route is around 62 kilometres long (plus 47 kilometres to San Blás).