Peneda-Gerês

Portugal designated one national park in 1971 and then stopped, and the choice explains itself on the ground. Peneda-Gerês is a horseshoe of granite ranges — Peneda, Soajo, Amarela and Gerês, west to east — bent around the upper valleys of the Lima, Homem and Cávado rivers, opening north onto Galicia where the Spanish Baixa Limia–Serra do Xurés natural park continues the same mountains under a different flag. The rock is two-mica granite weathered into domes, tors and boulder chaos; the rainfall is the highest in Portugal, better than 3,000 millimetres on the Gerês crest, which is why the ravines still carry the country's best surviving oak forest and why every second valley holds a waterfall-fed pool the colour of bottle glass.

The Romans left the park its spine. The Geira — Via Nova on the itineraries — ran from Braga to Astorga, and its climb through the Homem valley is still lined with dozens of inscribed milestones, the densest such sequence anywhere in the former empire, standing in the shade of the Mata de Albergaria oak wood. The living archaeology is younger but stranger: the villages of Soajo and Lindoso keep tight-packed platforms of espigueiros, narrow granite granaries raised on staddle stones and roofed with crosses, part corn store and part shrine. Up on the plateaus, paired settlements — summer brandas, winter inverneiras — record a transhumance that moved whole villages with the cattle, and the communal vezeira herding of the high pastures survives in places still.

What the terrain protected, the fauna kept. Peneda-Gerês holds Portugal's most solid population of Iberian wolf, shadowing the half-wild garrano ponies and the long-horned barrosã and cachena cattle that are its practical diet; roe deer, otter and golden eagle fill out the cast, and an ibex subspecies lost in the 1890s has been quietly recolonizing from Galicia. The botany is the connoisseur's layer — the Gerês lily, a violet iris found nowhere else on Earth, flowers in the granite scree in May, and the Serra do Gerês holds relict stands of holly and yew between the oaks.

What's worth knowing before you go

The park has no single gate. Vila do Gerês, a nineteenth-century spa town in a canyon of the southern range, is the busiest base and keys the waterfalls and the Pedra Bela viewpoint; Ponte da Barca and Arcos de Valdevez serve the Peneda and Soajo side; Montalegre covers the remote eastern plateau around Pitões das Júnias, where a ruined Cistercian monastery sits in a stream gorge. Braga is the practical railhead, with buses onward to Gerês. The famous pools — Tahiti and Arado among them — are mobbed in August; the honest season is May–June or September, when the levadas run full and the villages are working rather than performing. Note that the road through the Mata de Albergaria is a transit corridor with a no-stopping rule enforced in summer — park below and walk the Geira instead, milestone by milestone. The detail worth planning around: stay a night in Soajo or Lindoso rather than day-tripping, and see the espigueiros at dusk when the granite goes amber and the sound is cowbells, not coaches.