De Sallandse Heuvelrug

De Sallandse Heuvelrug National Park is a heathland ridge in the province of Overijssel, eastern Netherlands, encompassing approximately 3,650 hectares. The park takes its name from the Salland region and the Dutch word 'heuvelrug' meaning ridge of hills. At its highest point, the Nijverdal Berg reaches 76 metres above sea level, making it one of the most elevated landscapes in the eastern Netherlands. The ridge is a product of Pleistocene glaciation and supports extensive heathland and Scots pine forest. The park is renowned as the only site in the Netherlands where black grouse (Lyrurus tetrix) still maintain a small breeding population, making their conservation the park's flagship conservation goal.

The park's iconic species is the black grouse, with the Dutch population—concentrated almost entirely on the Sallandse Heuvelrug—numbering fewer than 50 individuals. Males perform their spectacular lek displays on open heath in April and May. Eurasian nightjar, woodlark, and European stonechat breed on the open heathland. The forest areas support Eurasian sparrowhawk, great spotted woodpecker, and tawny owl. Common lizard and slow worm occur throughout. The wet heathland areas support great sundew (Drosera anglica) and common cottongrass. Adder and sand lizard inhabit the dryer sandy sections of the ridge.

Heather (Calluna vulgaris) and bell heather (Erica cinerea) dominate the dry heathland with cross-leaved heath (Erica tetralix) in the wetter zones. Purple moor-grass (Molinia caerulea) is locally abundant and actively managed to prevent it from shading out heath vegetation. Scots pine (Pinus sylvestris) forest occupies areas where heathland management has lapsed. Birch and oak also occur. Rare heathland mosses and lichens colonise the oldest undisturbed heath patches. Bilberry (Vaccinium myrtillus) forms dense carpets in the pine forest understorey and provides critical food for black grouse. Crowberry (Empetrum nigrum) is at the southern edge of its Dutch range here.

The Sallandse Heuvelrug is a Pleistocene push moraine, formed when Scandinavian ice sheets overrode existing sandy outwash material during the Saalian glaciation. The resulting ridge consists of pushed-up sands, gravels, and occasional larger stones (erratics) transported from Scandinavia. The permeable sandy substrate drains rapidly and creates the nutrient-poor conditions required by heathland vegetation. Groundwater seeps at the base of the ridge support wet heath and fen communities. Several small kettle lakes (pingo ruins) attest to former periglacial conditions after the ice retreated.

The park experiences a temperate maritime climate with a continental influence. Winters are cold for Dutch standards, with frequent frosts and some snowfall. January temperatures average around 1–2°C. Summers are warm, with July averages of 17–18°C, and the ridge experiences slightly higher wind speeds than surrounding lowlands. Annual precipitation is around 750–800 mm, with convective thunderstorms common in summer. The open heathland is vulnerable to late spring frosts, which can damage the heather growth flush, while extreme summer drought creates fire risk and can significantly damage Sphagnum communities in wetter areas.

The Sallandse Heuvelrug has been settled since the Neolithic, with burial mounds (tumuli) from the Bronze Age marking the skyline along the ridge. Through the medieval period the heathland was used as communal grazing land by the surrounding villages of Rijssen, Nijverdal, and Hellendoorn. The industrial revolution brought the construction of a railway line through the Nijverdalse Berg, requiring the excavation of the only railway tunnel in the Netherlands (opened 1865). Large-scale afforestation of the heathland began in the late 19th century to combat drifting sand and to provide commercial timber. Most of this plantation forest dates from the period 1880–1940.

Various sections of the Sallandse Heuvelrug were protected as nature reserves from the mid-20th century. The area achieved National Park status in 2002. The flagship conservation project from the outset has been the management of the heathland specifically for black grouse, a species that had declined catastrophically throughout the Netherlands during the 20th century due to heathland loss. Since designation, over 500 hectares of pine forest have been cleared to restore open heath, and predator management (control of foxes and corvids) has been implemented during the breeding season to improve grouse chick survival.

The park offers approximately 40 kilometres of marked walking trails, including the long-distance Pieterpad route that crosses the ridge. The viewpoint tower on the Nijverdal Berg offers panoramic views across the IJssel valley. Cycling routes cross the ridge and connect to the broader eastern Netherlands cycle network. Black grouse lekking viewpoints are managed by park rangers in spring, with access strictly controlled to minimise disturbance. Guided dawn walks to observe the lek are among the most sought-after wildlife experiences in the Dutch national park system. The historic railway tunnel at Nijverdal is a local landmark.

The main visitor centre, De Heuvelrug Visitor Centre, is located at Nijverdal and features interactive displays on the park's ecology and black grouse conservation. There are car parks at multiple trailheads along the ridge. The park is accessible by train to Nijverdal station on the Almelo-Marienberg line. Cycling from Nijverdal town centre takes approximately 10 minutes. The park is open year-round without an entrance fee. Guided ranger tours, including early-morning black grouse lek tours (April–May), can be booked through the visitor centre. Accommodation is available in Nijverdal and surrounding villages.

The conservation of black grouse is the dominant management priority, requiring a mosaic of open heathland, bilberry scrub, and open-structure woodland. Annual monitoring of the lek count provides the key performance indicator. Predator management is conducted under a strict protocol, targeting red fox and corvids during the breeding season. Heathland management includes mechanical cutting, sod removal, and controlled burning in rotation. The park participates in a European black grouse network (GRINP) coordinating conservation across the species' fragmented range. Long-term population viability is at risk; the park is exploring supplementary release programmes using birds from Belgian populations.