Nordby Bakker Protected Area: A Glacial Moraine Landscape in Region Midtjylland

The protection history of Nordby Bakker stretches back to the mid-twentieth century. The first formal conservation easement over the area was established in 1949, marking early recognition of the site's landscape and ecological value. A series of further easements followed during the 1960s and again in 1980, gradually building up the layered protection framework that today covers around 480 hectares of the protected area, including a continuous easement running from Issehoved south to Ballebjerg and the adjacent Kragemose wetland.

In the modern era, Nordby Bakker was designated as Natura 2000 site number 58 and classified as an EU Habitat Directive site, designated H182, with a total area of approximately 628 hectares. A Natura 2000 plan was adopted in 2011, after which the Nature Agency and Samsø Municipality prepared binding action plans for its implementation, and the plan has been carried forward into later planning periods. The terrestrial natural plan is coordinated with the water plan for the Aarhus Bay catchment area, reflecting the integration of freshwater, terrestrial, and coastal management. State ownership through the Danish Nature Agency extends to roughly 281 hectares within the site.

The landscape of Nordby Bakker is shaped above all by its terminal moraine, the ridge-like accumulation of glacial debris deposited where the Great Belt glacier halted near the end of the last ice age. This produces a gently undulating terrain that rises inland to its highest point at Ballebjerg, about 64 meters above sea level, before dropping again toward the coast. The moraine creates the open, hilly stage on which the area's ecological value is set.

Along the northwestern and northern coastline, the moraine meets the sea in a varied coastal landscape. Active dunes, older gray and white dune systems, and lime-rich beach ridges fringe the shore, while in places the land ends in coastal cliffs and erosion gullies worn into the moraine and underlying deposits. Inland, the open terrain is broken by scattered thorn scrub, small plantations of conifers, and a mosaic of fields and grazed grassland. Several small lowland lakes lie within the protected area, creating pockets of still water within the predominantly dry landscape.

Nordby Bakker is fundamentally a dry grassland landscape, framed by dune and coastal habitats on one side and by inland freshwater features on the other. The principal ecological asset is the extensive complex of dry grassland, including both calcareous sandy dry grassland and true calcareous grassland, which together account for the majority of the protected area. These grasslands support a species-rich flora and a specialized insect fauna that depend on open, warm, and sun-exposed conditions.

Around the coast, the site protects shifting beach ridges with both annual and perennial vegetation, active white dunes, older gray-green dune heath, and coastal cliff habitats, as well as small patches of coastal grassland. Inland, a handful of nutrient-rich lakes, some created or restored in recent decades, provide freshwater habitat. The varied mosaic of dry grassland, dune, cliff, scrub, and small wetland creates a habitat patchwork that supports unusually high botanical diversity for Denmark.

The wildlife significance of Nordby Bakker lies less in charismatic large mammals than in its specialized invertebrate fauna and amphibians. The dry, warm calcareous grasslands shelter several red-listed insect species, including the dung beetle known as the moon scarab and butterflies such as the pale orange-tip and the pearl-bordered fritillary. These insects depend on the persistence of large, undisturbed open grassland with their associated wildflowers.

Amphibians are represented by the great crested newt, which is listed in the site's official designation, while the green toad is relatively common throughout the area and has been a focus of recent pond management. The mosaic of dry grassland, scrub, dune, and freshwater provides a setting in which even small wildlife communities can be unusually rich, contributing to the site's broader value as a habitat island within an intensively used agricultural region.

Nordby Bakker is one of the most important dry grassland reserves in Denmark and is recognized at the European level through its Natura 2000 and Habitats Directive status. It holds a nationally significant share of the country's dry calcareous sand grassland and a substantial proportion of the calcareous grassland found within Danish habitat sites, which gives it an outsized role in the national conservation strategy for these habitat types.

Conservation management on the site combines long-standing legal protection with active restoration. Roughly 480 hectares are covered by conservation easements, the first of which dates from 1949, providing a stable baseline of legal protection. Active management includes grazing to maintain open dry grassland, restoration and creation of small lakes for amphibians, and coordination with broader Natura 2000 planning, water planning for the Aarhus Bay catchment, and municipal action plans led by Samsø Municipality and the Danish Nature Agency.

Nordby Bakker is closely tied to the identity of northern Samsø and its long history as an island shaped by farming, grazing, and coastal life. The open hills and coastal cliffs have long served as common landscape for grazing and seasonal land use, and the persistence of large areas of never- or long-uncultivated grassland reflects centuries of low-intensity land management rather than deliberate rewilding. Today, the area is part of how residents and visitors experience the natural character of Samsø, marking the transition between the island's cultivated interior and its exposed northern coastline.

Nordby Bakker combines several features in a single protected area: a clear glacial landform in the form of the Great Belt glacier's terminal moraine, one of Denmark's largest connected dry calcareous grassland complexes, and a varied coastal fringe of dunes, beach ridges, and cliffs. The site stands out nationally for its rare dry grassland flora and red-listed insect fauna, and regionally as the signature natural landscape of northern Samsø.

The dry grasslands, dunes, and coastal scenery of Nordby Bakker are most expressive in late spring and summer, when warm weather brings out the wildflower displays on the calcareous slopes and supports the most active period for butterflies and other insects. Cooler seasons still offer clear views across the open moraine landscape and along the coast, but the combination of flowering grassland and insect activity that gives the area its distinctive character is concentrated in the warmer months of the year.