A unique phenomenon in Portugal and very rare worldwide, it consists of stones growing and detaching from their "mother stone," hence their popular name "birthing stones." To better understand these enigmatic rocks and the dynamics of the Arouca Geopark, it is worth visiting the Casa das Pedras Parideiras – Interpretation Centre.

The Arouca Geopark encompasses the administrative area of ​​the Municipality of Arouca, which has distinguished itself through its exceptional geological heritage of international relevance, recognized by the UNESCO European and Global Geoparks Network since 2009. The valuable and unique inventoried geological heritage covers a total of 41 geosites, with particular emphasis on the famous "Birthing Stones" of Aldeia da Castanheira (Serra da Freita) and the Giant Trilobites of Canelas.

A well-known waterfall that plunges approximately 60 meters from the top of the Freita mountain range. It is located between Vale de Cambra and Arouca. It can be appreciated from a viewpoint near Castanheira, on the opposite side of the slope.

It has its spring on the Freita hill, in Urrô, and its mouth on the Arda river, in Rossas.

It has its spring on the Nave hill, at Moimenta da Beira, and its mouth on the Douro river, near Castelo de Paiva.