For centuries, the narrative about the Netherlands has centered on the North Sea creeping inland. We picture the water as the aggressor, forcing the Dutch to construct massive dikes and pump stations to hold back a rising tide. However, new research suggests the primary driver of this transformation was not the ocean, but the ground itself. A thousand-year reconstruction of the Dutch coastal plain shows that much of the land fell, effectively meeting the water rather than being consumed by it.
Between the years 1000 and 1300, the landscape changed through human intervention. Farmers drained peatlands to create agricultural space, which caused the ground to shrink and compact. Additionally, the extraction of peat for fuel removed vast volumes of material. This combination of drainage and excavation lowered the surface by an average of nearly two metres. Nearly 20 cubic kilometres of peat disappeared, creating the geography we recognize today.
The research indicates that 26 percent of the country sits below sea level largely due to these historical land-use practices. While global sea levels were relatively stable during that period, the land subsidence forced the coastal plain downward. This creates a persistent issue for the present and future. Subsidence remains an active process, with current rates in some areas reaching up to 25 millimetres per year.
The core of the problem lies in the ongoing management of water tables. Lowering the water level to support farming exposes more peat, which triggers further oxidation and sinking. While the Netherlands has begun to adjust drainage depths to mitigate this effect, the situation faces new pressure. Unlike the stable ocean conditions of the medieval period, the sea is now rising. The combination of man-made subsidence and modern climate-driven sea-level rise creates a distinct challenge for coastal management in the coming century.