The Côa river source is in Malcata mountain range, and flows as an affluent into the Douro river.
In the last course of the Côa river Valley we can see all the Paleolithic art and archaeological sites. The schist rocks that occupy the valley have been converted into art canvases with hundreds of engravings.
The Côa river Valley is one of the world´s most important rock art sites, displaying open-air artistic manifestations from different moments of Prehistoric, Protohistoric and Historic time.
This Paleolithic open-air engravings show how this place is so special and significant, that is why it was classified as the Word Heritage by UNESCO.