When we envision national defense, the images that most readily spring to mind are of advanced machinery: rolling tanks, buzzing drones, and imposing border walls. It is rare that a landscape feature, let alone a seemingly passive and soggy one like a peatland, enters the strategic conversation. Yet, across Northern Europe, a profound reassessment is underway. The inherent qualities of these wetlands—their saturated grounds, tangled vegetation, and general impassability—are increasingly recognized as factors of genuine relevance to security policy. This perspective merges the urgent imperatives of ecological restoration with the age-old demands of territorial defense, creating a novel approach where environmental stewardship becomes a cornerstone of national resilience.
This strategic convergence is most immediate for NATO’s eastern flank. The Baltic states of Estonia, Latvia, and Lithuania, as part of their collaborative Baltic Defence Line initiative, are actively examining how to incorporate peatlands and other wetlands as natural barriers. For these nations, bordered by Russia and Belarus, the terrain itself is a component of spatial defense. Lithuania, for instance, plans to restore 6,000 hectares of peatland as what its deputy defense minister termed “an integral defensive line.” Similarly, Poland’s “Eastern Shield” defense plan designates hundreds of kilometers of dense, wild landscape along its eastern border as a key impediment to advancement. The logic is sound and economical: rewetting peatlands is significantly cheaper than constructing anti-tank ditches or laying minefields, and it creates a persistent, maintenance-free obstacle that channels any potential aggressor into predictable, easily monitored corridors.
The historical precedent for this is powerful, as noted by leading peatland researchers like Professor Hans Joosten of the Greifswald Mire Centre. He points to the Prypiat Marshes between Belarus and Ukraine, which for centuries acted as a vast natural buffer. Notably, when Soviet-era plans aimed to drain these wetlands in the 1960s, it was the Russian Defense Ministry itself that fiercely objected, arguing, “These peatlands stopped Napoleon, they stopped Hitler.” This historical role has been starkly validated in the ongoing war in Ukraine, where flooded fields and swampy ground have repeatedly bogged down and redirected mechanized advances, proving that a sodden landscape can be as formidable as any fortification. From the peasant armies of Dithmarschen to the defense of Kyiv, wetlands have consistently served as nature’s own moats.
For a nation like Germany, the calculus is more layered but no less relevant. Domestically, peatland policy has been driven overwhelmingly by climate goals; drained peatlands are a massive source of carbon emissions, accounting for 7% of Germany’s total. Rewetting them is a non-negotiable step toward climate neutrality. The new defense perspective adds a compelling, complementary argument to an already essential ecological project. As Stefan Bayer of the German Institute for Defence and Strategic Studies notes, well-scaled restoration can “increase the efficiency of defence spending” by creating natural chokepoints. However, Germany’s role as a central logistics hub for NATO necessitates a balance—while rewetting can hinder an adversary, it must not impede the vital eastward movement of allied troops, requiring careful, corridor-based planning.
This intersection of climate action and security points to a broader, necessary shift in mindset. For decades, peatland restoration has been siloed as an environmental issue, while defense has been associated with “heavy metal”—tangible hardware and infrastructure. Bridging these domains exemplifies the kind of integrated thinking required by our interconnected challenges. As Bayer observes, the much-discussed Zeitenwende, or turning point, has not yet permeated all societal sectors. Framing a restored wetland as simultaneously a carbon sink, a biodiversity refuge, a water reservoir, and a strategic buffer is a powerful corrective. It demonstrates that addressing the climate crisis can inherently bolster national and alliance security, creating multi-layered resilience against a spectrum of threats.
Ultimately, the core motivation for rewetting peatlands must remain the planetary imperative of climate action. The security benefits are a potent, co-beneficial argument, not the primary goal. Proponents like Jan Peters of the Michael Succow Foundation rightly urge careful language; this cannot be misconstrued as a nationalist land fortification but must be framed as a shared, resilient landscape within the European community. A swamp alone cannot stop modern weaponry, but as part of an integrated defense architecture, it offers unique and sustainable value. It requires no maintenance, operates at minimal cost, and performs its protective function in silent, perpetual synergy with the natural world, proving that sometimes the most sophisticated defense is not built, but cultivated.
