Réserve naturelle régionale de l'Escaut-rivière: Mapped Protected Alluvial Landscapes

The history of this stretch of the Escaut valley reaches back at least to the Neolithic and Roman periods, but the modern history of the site as a protected natural area is much more recent. The Napoleonic cadastre already shows a largely undeveloped valley floor shaped by long, narrow parcels, evidence of a long tradition of hay production, seasonal pasture and limited riverbank gardening. Toponyms such as Les Prés, Les Foursières and Les Riez testify to old fish ponds, hay meadows and fallow lands along the river.

In the late nineteenth century, the Chenu family acquired the valley-bottom wet meadows and gradually afforested them with fast-growing poplars, creating the estate that became known as the Bois Chenu. A century later, the poplar plantation was largely felled during the First World War, then replanted and managed as a poplar grove until the municipal authority of Proville bought the site in 1984 with support from the Ministry of the Environment.

A first management plan was drafted in 1985 by the French National Forests Office (Office National des Forêts), and an unauthorized clear-cut during the winter of 1994 to 1995 left only scattered stumps and branches. Public reaction was strong, and a new municipal team began a renaturation programme in 1995 based on a restorative management plan. In 1996, a long-term lease allowed a team of seven young workers to restore the remaining 12 hectares of wet meadows, rebuild hedges, dig new ponds and create a public discovery trail.

The Reserve was proposed by the commune in 2007, administratively validated on 10 October 2011 and formally inaugurated on 23 June 2012 after the installation of educational signage and visitor infrastructure. Since then, the reserve has continued to host researchers, students and school groups as a long-term reference site for alluvial forest regeneration and wetland restoration.

Ecologically, the reserve is a remarkable example of a temperate alluvial complex that combines three main habitat types: wet meadows maintained by late mowing and extensive grazing on the left bank, a mosaic of marshes, ditches and reedbeds, and a young alluvial woodland in active regeneration on the right bank. The vegetation pattern includes reed communities dominated by Phragmites australis, sedge-dominated caricaies, willow formations, ash-alder forests with bird cherry, and wet meadows associated with Filipendula ulmaria.

Around twenty distinct biotopes have been identified on the site, and the management plan aims to maintain this diversity as the forest continues to evolve naturally. The reserve's botanical interest includes species such as the stream avens (Geum rivale), the sneezewort (Achillea ptarmica), the autumn crocus (Colchicum autumnale), the marsh orchid Dactylorhiza praetermissa, the aquatic buttercup Ranunculus aquatilis and the European white elm (Ulmus laevis). The yellow wood anemone (Anemone ranunculoides), absent for about a century, was rediscovered in the Bois Chenu in 2010.

More broadly, the reserve is part of a broader ecological network that includes the green and blue infrastructure of the Hauts-de-France region and Natura 2000 valleys of the Scarpe and the Escaut further downstream, supporting ecological continuity along one of Europe's major river corridors.

By 2012, inventories had identified around 220 animal species on the site, including roughly 25 considered of heritage value, while more than three quarters of the plant formations are themselves of regional heritage interest. The reserve's fauna reflects its mosaic of wet meadows, marshes, reedbeds and forest, with several emblematic groups well represented.

Among the invertebrates, the reserve hosts at least seven dragonfly species of determinant status, including Lestes dryas, Calopteryx virgo, Ischnura pumilio, Coenagrion scitulum, Sympetrum danae and Sympetrum flaveolum, alongside the rare Lesser Purple Emperor butterfly (Apatura ilia), a species characteristic of alluvial woodlands and now very uncommon in northern France. The fish community includes protected pike (Esox lucius), the European eel (Anguilla anguilla) and the bitterling (Rhodeus sericeus), which is essential for the reproduction of native freshwater mussels.

Birds include the Marsh Harrier (Circus aeruginosus), which nests in the reedbeds and is listed on Annex I of the Birds Directive, the Bluethroat (Luscinia svecica), the Water Rail (Rallus aquaticus), the European Kingfisher (Alcedo atthis), the Cetti's Warbler (Cettia cetti) and the Sedge Warbler (Acrocephalus schoenobaenus), along with the recently returned Aquatic Warbler (Acrocephalus paludicola). Molluscs include the European protected Desmoulin's whorl snail (Vertigo moulinsiana). Fungi are also a major component of biodiversity: the Bois Chenu alone supports more than 350 recorded mushroom species, around ten percent of the region's known fungal diversity, with the rare Rhodotus palmatus again observed thanks to the reintroduction of dead wood.

From a conservation standpoint, the reserve protects one of the last large remnants of a habitat type, the alluvial complex of the upper Escaut, that has become among the most threatened in Western Europe. Wetland meadows, marshlands and ash-alder forests of this type were once widespread in northern France floodplains but have been largely eliminated by drainage, agricultural intensification and canalization. Their loss is particularly severe in the Cambrésis, where wetlands now cover less than one percent of the territory.

The reserve combines a strong management role with active ecological restoration. Since the clear-cut of the former poplar grove in 1994, the site has been progressively restored through a renaturation approach that lets natural dynamics drive woodland recovery while using late mowing and extensive grazing to keep meadows open. Dead wood is deliberately retained to support saproxylic species and fungi, and experimental plantations by INRA and the regional forestry centre have compared different silvicultural approaches in alluvial conditions.

Beyond its local value, the reserve contributes to wider conservation frameworks, including the Hauts-de-France regional green and blue infrastructure, the national Trame verte et bleue as a recognized biodiversity reservoir, and the pan-European ecological network. It plays a tangible role in flood regulation, water filtration and climate moderation at the local scale, while serving as a key node on one of Europe's largest fluvial ecological corridors.

The reserve occupies a stretch of valley that has supported human activity since at least Neolithic times and was clearly used during the Roman period. The Napoleonic cadastral maps already show a pattern of long, narrow parcels along the Escaut, a typical signature of riverbank hay meadows and small-scale gardening that persisted into the modern era. Old local toponyms such as Les Prés, Les Foursières and Les Riez preserve the memory of a working rural landscape shaped by fishing, haymaking and seasonal grazing.

The Bois Chenu and the adjacent meadows were privately held for generations, most notably by the Chenu family, whose nineteenth- and twentieth-century stewardship shaped the area before public acquisition. The restoration effort that followed has also become a model of participatory conservation: the project received several regional eco-action awards in the late 1990s and early 2000s, and today the site hosts school activities, teacher training by the national education system and an interpretive area named the Espace Chico Mendes.

The reserve's standout qualities include its status as the last natural reach of the upper Escaut, its pioneering alluvial forest regenerating spontaneously since 1994, and its role as one of the few wetland biodiversity reservoirs in the historically arid Cambrésis plain. It combines a functioning mosaic of meadows, marshes and woodland on a remarkably small surface area.

Equally notable are its richness in indicator and protected species, including the Marsh Harrier, the European Kingfisher, the Desmoulin's whorl snail and more than 350 fungal species, and its situation within the broader Escaut river corridor, one of Europe's major fluvial biological corridors connecting France, Belgium and the Netherlands.

The reserve can be visited year-round along the Chemin Noir walking trail, which crosses the wet meadow sector from east to west, and along the woodland path looping around the Bois Chenu. A footbridge over the Escaut connects the two sides. The site lies in a temperate oceanic-to-transitional climate zone, with relatively low regional rainfall of around 645 mm per year, and water levels generally lower in summer and higher in winter.

Spring and early summer are particularly rewarding for observing the wetland flora, reedbed birds and dragonflies that emerge as temperatures rise. Autumn brings fungal activity and changing woodland colours, while winter offers the highest water levels and the best chance to observe waterbirds and the dynamics of the river's floodplain. Sturdy footwear is recommended in all seasons because much of the ground is regularly saturated.