Serra de Pias

Serra de Pias is a hill in northern Portugal, in the municipality of Valongo near Porto. It rises to 385 metres above sea level and serves as one of the green escapes of the Porto metropolitan area. It is also known as Serra do Raio. It suits anyone who wants a walk in the hills without travelling far from the city.

Where is Serra de Pias?

The summit lies southwest of the parish of Campo in Valongo, close to the boundary with Aguiar de Sousa, a parish in the municipality of Paredes. Its slopes drain in two directions: north toward the Ferreira River and south toward the Sousa River. The result is a rolling, stream-cut landscape with a real mountain feel.

What is the Serras do Porto Park?

Serra de Pias belongs to Serras do Porto Park, a protected landscape. Locals call it the green lung of the Porto metropolitan area. Together with the neighbouring Santa Justa ridge, it forms a group of hills crossed by a network of trails and paths.

Why does the geology matter?

Geologists value this place. The rocks date to the Paleozoic era or earlier, with ages beyond 350 million years. A large structure called the Valongo anticline marks the mountain. In 1998 the Paleozoic Park of Valongo was created here to present these formations to visitors and to support education.

What is the mining history?

Minerals have been extracted here since ancient times, including gold and antimony. Today slate is still quarried at the foot of the mountain, in the Milhária and Vinhas areas of Campo parish. Traces of the old mines also attract mineral collectors.

What can you do here?

The area is used for hiking, cycling and horse riding. Routes include stairs, boardwalks and viewpoints. The municipality of Valongo also runs educational visits to the Santa Justa and Pias ridges, which makes the site a fit for school groups and families.

Frequently asked questions

How high is Serra de Pias? It reaches 385 metres.

Can families hike here? Yes. There are walking, cycling and horse trails, plus stairs and boardwalks that ease the steeper sections.

Are there mines nearby? Gold and antimony were mined historically, and slate extraction continues at the foot of the mountain.

Which park does it belong to? Serras do Porto Park, a protected landscape, and the Paleozoic Park of Valongo.

When should I go? Spring and autumn offer comfortable temperatures for walking. Check municipal notices before setting out, as controlled burns are sometimes carried out in the area.

Serra de Pias combines nature, geology and traces of past industry in one place. If you are visiting Porto and want a few hours outdoors, consider adding it to your itinerary. Bring sturdy shoes, water and a camera, since the upper sections open up views over the surroundings. Half a day is enough for a visit, and getting there from the city takes little time.