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Dredging sludge has negative connotations but the Marker Wadden shows that the natural and economic value of dredged material is underestimated. Sludge, silt and mud are useful raw materials and building materials. They can be used for upgrading soils, raising dikes, nature development or land reclamation. So the spotlights at the Innovation Expo in Amsterdam today will be on the Marker Wadden: a unique ecosystem that will boost biodiversity, improve water quality, and create space for leisure activities and scientific research.