One of the Portuguese cities in which the Paiva river flows, Arouca is ideal for thrill-seekers and nature lovers. Home to Arouca Geopark, a national park that has geological heritage, you'll discover there the Canelas giant trilobites, the Castanheira Parental Stones, and the Vale do Paiva trace fossils. The Paiva River hosts the International Festival of white waters and is known to be one of the best rivers for the practice of activities in the white waters during the winter, such as rafting, kayaking, Canyoning, and canoeing. The different levels of altitude between its narrow throats and rocks make any activity on its waters exhilarating. The waters are often called white waters due to their foamy color and create a picturesque scene with its natural backdrop. The habitat within Arouca has biodiverse fauna and flora with protected and endangered rare species. Paiva's Walkways are also a highlight of Arouca, with the 516 Arouca Bridge being one of the longest in the world to walk along.