The Peneda-Gerês National Park, also known simply as Gerês, is a national park located in northern Portugal. Created on 8 May 1971, it is the oldest protected area and the only national park in Portugal due to its national and international scientific interest. The park covers an area of 695.93 km², occupying the Districts of Viana do Castelo, Braga, and Vila Real and bordering the Spanish Baixa Limia – Serra do Xurés natural park to the north, with which forms the UNESCO biosphere reserve of Gerês-Xurés.
Peneda-Gerês was given its name by its two main granite massifs, the Serra da Peneda and the Serra do Gerês which, with the Serra Amarela and the Serra do Soajo, constitute the park's mountainous, bouldery areas. On the other hand, the precipitous valleys, crossed by high flowing streams, host lush temperate broadleaf and mixed forests of oak and pine, being one of the last strongholds of the typical Atlantic European flora of Portugal, contrasting with an evolving Mediterranean biome. The park is also home to around 220 vertebrate species, some only native to the Iberian Peninsula including the threatened Pyrenean desman, Iberian frog, or gold-striped salamander.