Alta Valle Pesio e Tanaro

The Alta Valle Pesio e Tanaro Natural Park, established in 1978 and reorganised in 2012 as the Parco del Marguareis, protects the upper valleys of the Pesio and Tanaro rivers in the Ligurian Alps of southern Piedmont. ^[1] Covering around 80 square kilometres in the province of Cuneo, it is centred on the Marguareis massif, whose limestone summit reaches 2,651 metres and hosts the most important high-mountain karst in Piedmont, with more than 150 kilometres of surveyed caves. ^[2] The park combines extensive beech and fir forests, alpine pastures and dramatic carbonate cliffs with a rich cultural heritage anchored by the Certosa di Pesio, a Carthusian monastery founded in 1173. It is renowned for its botanical richness and as the site of the first documented wolf pack to recolonise the Italian Alps.

The park's varied habitats support one of the richest faunas in the southern Piedmontese Alps. Its greatest claim is ecological: in the mid-1990s the Alta Valle Pesio hosted the first documented breeding wolf pack to recolonise the Italian Alps, a milestone in the species' natural return after an absence of many decades. ^[1] Chamois and roe deer are common, alongside wild boar, red fox, badger, marten and, in the high rocks, marmot colonies. Golden eagles nest on the Marguareis cliffs, sharing the airspace with buzzards, kestrels and, increasingly, reintroduced griffon vultures and the occasional bearded vulture. The extensive cave systems harbour bats and specialised cave invertebrates, while streams support brown trout and amphibians such as the alpine newt and fire salamander among the forested slopes.

Botanical diversity is a hallmark of the park, with roughly 1,500 plant species recorded across its altitudinal range and varied bedrock — nearly one quarter of Italy's entire flora within a relatively compact area. ^[1] Lower and middle slopes carry magnificent beech and silver fir forests, among the finest in the western Alps, giving way to larch and mountain pine before the treeline. Above, the limestone summits of the Marguareis support a specialised calcareous alpine flora rich in endemics and rarities, including saxifrages, primulas, gentians, orchids and cushion plants adapted to thin, well-drained soils. Damp meadows and springs host marsh species, while sunlit rocky slopes favour drought-tolerant herbs. The interplay of carbonate and siliceous rocks, combined with a mild southern-Alpine climate, creates exceptional habitat variety within the protected area.

The park is dominated by the Marguareis massif, a great block of Mesozoic limestone and dolomite that constitutes the most significant alpine karst region in Piedmont. Millennia of dissolution have created a labyrinthine underground world: more than 150 kilometres of caves, deep shafts, sinkholes and underground rivers penetrate the massif, making it one of the premier speleological areas in Italy. ^[1] On the surface, karren fields, dolines and towering pale cliffs characterise the high country, while the Pesio river emerges from powerful karst springs at the valley head. Beneath and around the carbonate cover lie older crystalline and metamorphic units of the Ligurian Alps, but it is the soluble limestone that defines the park's spectacular scenery and hydrology.

Straddling the divide between the Po plain and the Ligurian coast, the park experiences a southern-Alpine climate that is generally milder and wetter than the inner Alps. Moist air from the Mediterranean brings abundant precipitation, feeding the beech and fir forests and sustaining the karst hydrology, with heavy snowfall on the high Marguareis in winter. Summers are relatively cool and thundery at altitude, while the valley floors around the Certosa enjoy warmer, sheltered conditions. Spring and autumn are often changeable, with fog and rain, and the porous limestone means surface water quickly disappears underground. This combination of high rainfall and carbonate rock underpins both the park's lush vegetation and its extensive cave systems.

Human history in the valleys is shaped above all by the Certosa di Pesio, a Carthusian monastery founded in 1173 at the head of the Pesio valley. ^[1] For centuries the monks managed the surrounding forests, waters and pastures, leaving a lasting imprint on the landscape before the complex later became a spa and religious retreat. Beyond the monastery, the upper Pesio and Tanaro valleys were long inhabited by mountain communities practising transhumant grazing, forestry, charcoal-burning and small-scale farming. Old mule paths, alpine huts and terraced clearings testify to this pastoral economy. The strategic border position near France also left traces of military tracks and fortifications, while the caves attracted early speleological exploration that continues to reveal the massif's hidden depths.

The Alta Valle Pesio e Tanaro Natural Park was established in 1978 by the Piedmont region to protect the outstanding forests, karst landscape and biodiversity at the heads of the Pesio and Tanaro valleys. ^[1] Over the following decades it became a focus for research on alpine flora, cave systems and large carnivores, gaining prominence when wolves recolonised the area in the mid-1990s. In 2012 a regional reorganisation of protected areas renamed the park as the Parco naturale del Marguareis, consolidating management of the wider massif under a single authority. Throughout its history the park has combined strict conservation of its high-mountain core with support for the cultural landscape of the Certosa and surrounding valleys.

The Certosa di Pesio, a monumental Carthusian monastery dating to 1173, is the park's cultural centrepiece and a natural starting point for exploration. ^[1] From the valley head a well-developed trail network climbs through beech and fir forests to alpine meadows, mountain refuges and the pale cliffs of the Marguareis. Popular objectives include the karst springs of the Pesio, panoramic ridge walks and long-distance routes linking to the French Mercantour and the Ligurian coast. Experienced cavers are drawn to the massif's vast underground systems, while botanists visit for its rare alpine flora. Waymarked paths, mountain huts and interpretive centres make the area a hub for hiking, wildlife watching and multi-day mountain traverses.

The park lies in the province of Cuneo, reached via Chiusa di Pesio and other valley villages a short drive from Cuneo and Mondovì, with the Turin motorway network within about ninety minutes. Most visitors arrive by car to trailheads near the Certosa di Pesio, from where footpaths fan out into the mountains; local bus services connect the main valley towns. Facilities include visitor and information centres, staffed mountain refuges, marked trails and picnic areas, with the Certosa complex offering historical interest. Accommodation is available in the surrounding villages and huts. The high country demands proper mountain equipment and caution, especially for cave exploration and snow-covered routes, and the park authority provides guidance and guided activities in season.

Conservation in the Alta Valle Pesio e Tanaro centres on protecting its exceptional karst systems, old-growth beech and fir forests, and recovering large carnivore populations, most symbolically the wolves that returned in the mid-1990s. Management safeguards the fragile cave environments from pollution and disturbance, maintains forest health and monitors the park's rich alpine flora, including numerous endemic and threatened species. Traditional grazing is supported where it sustains meadow biodiversity, while research and monitoring track wildlife, water quality and climate impacts on the sensitive high-mountain habitats. As part of the Parco del Marguareis and cross-border conservation networks linked to the French Mercantour, the park promotes low-impact tourism, environmental education and coordinated protection of one of the western Alps' most valuable natural landscapes.