Naturpark Hohe Mark Protected Landscape: Geographic Boundaries and Regional Terrain Mapping

Naturpark Hohe Mark was established in 1963 as one of the designated nature parks of North Rhine-Westphalia, reflecting the mid-twentieth-century German movement to create large, multifunctional protected landscapes that combine nature conservation, recreation, and regional identity.

Its foundations were also shaped by the broader narrative of the Hohe Mark as a 'green bridge' between the industrial Ruhr area and the rural Münsterland, a theme that was already being expressed in regional literature of the 1970s. The park gradually developed its identity around a triad of landscapes: the Münsterland parkland to the northeast, the central wooded upland of the Hohe Mark, and the river-dominated Lower Rhine landscape to the west.

In more recent decades, the park has expanded its role as a recreation hub, with major investments in trail infrastructure. The Hohe-Mark-Steig was conceived jointly by the Sauerländischer Gebirgsverein, the Haard-Trapper Wanderfreunde Datteln 1986, and the Hohe Mark Tourismus association, with its infrastructure built by the Regionalverband Ruhr and officially certified by the German Hiking Association in spring 2021 as a quality long-distance trail.

The park's landscape is defined by a sharp east-to-west transition. In the northeast lies the open, gently undulating parkland of the Münsterland: a patchwork of meadows, pastures, arable fields, small woodlands, and peat areas that has long been shaped by mixed farming.

Toward the south and center, the terrain rises into a forested upland built from Cretaceous quartz sands, locally known as the Halterner Sande. This sandy high country forms the Hohe Mark ridge, the Rekener Berge, Die Berge, the Haard, and the Borkenberge, often collectively referred to as the Halterner Berge. The summit of the Stimberg in the Haard, at about 156.9 meters above sea level, is the highest point in the western part of this belt. On the sunny faces of exposed sandstone outcrops such as those at the Opferstein in the Borkenberge and along the Stimberg, the iron-cemented Schwartensandstein develops a dark 'desert varnish' through weathering.

West of the wooded spine, the park drops into the Lower Rhine lowlands, where the Lippe, Issel, Bocholter Aa, and Stever rivers, together with the Wesel-Datteln canal, create a wet, open water landscape. Large lakes such as the Halterner Stausee, Hullerner Stausee, Heidesee, Heidhofsee, and Torfvennteich interrupt this low country, along with partially drained raised bogs such as the Weißes Venn near Haltern and the Schwarzes Venn near Heiden, parts of which now serve a dual role as military training areas and nature reserves. In the south, where the park meets the Ruhr area, legacies of coal mining, sand quarrying, and clay extraction add a distinctive post-industrial character to the scenery.

Ecologically, Naturpark Hohe Mark is a meeting point of the Westphalian Bight in the east and the Lower Rhine lowlands in the west. The park's habitats range from dry, nutrient-poor sandy heaths and pine forests on the central upland to wet meadows, fens, and raised bogs in the lowland basins, with rivers, reservoirs, and canals providing extensive aquatic and wetland habitat.

The partially drained peatlands around the Weißes Venn and Schwarzes Venn are particularly important for bog conservation, while the wet woodland and meadow complex of the Merfelder Bruch west of Dülmen supports one of the last semi-wild horse herds in central Europe, the Dülmener Wildpferde. Old-growth tree stands and traditional field-boundary oaks also give parts of the park a strong cultural-natural character.

The park's fragmented, transitional geography, sitting between industrial, agricultural, and more natural landscapes, allows it to function as a green corridor linking otherwise heavily modified landscapes and supporting species that depend on large, contiguous open and semi-open habitats.

The park's wildlife profile is shaped by the contrast between its dry uplands, its wet lowlands, and its semi-open pastoral areas. The Merfelder Bruch area west of Dülmen is internationally known for the Dülmener Wildpferde, a hardy semi-wild horse herd that roams a designated tract of wet woodland and meadow and represents one of the last such free-roaming horse populations in central Europe.

The park's water bodies support significant birdlife, including what is described as the first Westphalian colony of great cormorants, located in the Heubach lowlands near Dülmen, and a grey heron colony on the Overrather Insel in the Halterner Stausee. Reservoirs and canals such as the Halterner Stausee, Hullerner Stausee, and the Wesel-Datteln canal corridor are important feeding and resting habitats for waterbirds.

In the forested uplands, mixed and older deciduous woodlands provide shelter for typical central European forest fauna, while the open farmland and meadow areas sustain meadow-breeding birds, small game, and a range of insects tied to traditional, extensively managed agricultural landscapes.

As one of the largest nature parks in North Rhine-Westphalia, Naturpark Hohe Mark plays an important role in protecting a transitional landscape between the industrial Ruhr region, the agricultural Münsterland, and the Lower Rhine lowlands. Its size and continuity make it a significant green corridor in an otherwise heavily used part of western Germany.

Conservation efforts within the park focus especially on its peatland heritage. The Weißes Venn near Haltern and the Schwarzes Venn near Heiden, both partially drained raised bogs, are now managed partly as nature reserves alongside their continued use as military training areas, reflecting an unusual but established dual-use arrangement that has helped preserve large intact bog complexes.

The Merfelder Bruch, with its population of Dülmener Wildpferde, is another conservation centerpiece, maintaining both a culturally distinctive herd and the wet woodland-meadow landscape on which it depends. The park also serves as a habitat island network for waterbirds nesting in the reservoir and canal systems, and as a refuge for old trees and traditional parkland biodiversity that is otherwise declining across the region.

Naturpark Hohe Mark carries a strong sense of regional identity that ties together the Westmünsterland, the Lower Rhine, and the northern Ruhr area. The park has long been described in regional writing, including Ferdinand Oppenberg's 1974 volume, as a 'green bridge' between the industrial Ruhr and the rural Münsterland, a framing that still shapes how the park is presented locally.

The landscape holds significant cultural memory. The megalithic De Düwelsteene near Heiden and the ancient Femeiche oak in Erle (Raesfeld) connect the park to prehistoric and early historical periods, while the Dülmener Wildpferde represent a living link to older forms of land use and animal husbandry that have largely disappeared from central Europe.

Today, the park is also closely tied to outdoor recreation culture in the region, particularly through long-distance hiking routes such as the certified Hohe-Mark-Steig and the regional cycling, equestrian, and Nordic walking networks that crisscross its varied terrain.

The park's strongest highlights include the central sandy upland of the Hohe Mark with the Haard and Borkenberge, the irregular yet striking mix of Münsterland parkland and Lower Rhine river landscapes that surround it, and the large water bodies of the Lippe system, especially the Halterner Stausee.

Equally distinctive are the Merfelder Bruch, with its free-roaming Dülmener Wildpferde, the partially drained raised bogs of the Weißes Venn and Schwarzes Venn, and the cultural-natural landmarks of the De Düwelsteene megaliths and the ancient Femeiche oak. Together, these features give the park an unusual blend of ecological, geological, and cultural significance within a relatively compact regional setting.

Spring and early summer are particularly rewarding in Naturpark Hohe Mark: meadows and field margins come alive, woodland understoreys are fresh, and the wet lowlands around the Merfelder Bruch and the Lippe reservoirs are active with waterbirds and breeding birdlife. Late spring is also a good time to experience the contrast between the green pasture mosaic of the Münsterland side and the freshly flushing deciduous forests of the Hohe Mark.

Autumn brings rich color to the beech and oak stands of the Haard, Borkenberge, and Rekener Berge, and is a pleasant time for hiking the Hohe-Mark-Steig. Winter tends to be quieter, with the open landscapes around the reservoirs and the peat areas offering crisp views and good conditions for observing overwintering waterfowl.