Peneda-Gerês National Park is the only national park in Portugal. 

Peneda-Gerês National Park is in the districts of Viana do Castelo, Braga and Vila Real; set along the mountains of Peneda, Larouco, Geres, it is one of the most spectacular in the Iberian Peninsula. The park has a large variety of fauna - including deer, wild horses, wolves and birds of prey - and flora such as pine, yew, chestnut and oak trees, as well as medicinal plants.

There are a couple of nice hiking opportunities in the park. You can get free maps and information at the tourist information centre in Gerês, but they only offer information for nearby tracks. For information on other tracks you have to go to an office of the national park itself.

- Wikivoyage