This map is a combination of the processed habitat map of Flanders and the watersurface map of Flanders. It contains all aquatic standing water Natura 2000 habitat types and regional important biotopes in Flanders. The polygons with 2190_a habitat (dune slack ponds) are generated by selecting all watersurface polygons that overlap with dune habitat polygons (21xx) of the processed habitat map. For each of the other standing water habitat types (31xx, 7220 and rbbah) we select the watersurface polygons that ovelap with the selected habitat type polygons of the processed habitat map. We also select polygons of the processed habitat map containing standing water habitat but not overlapping with any watersurface polygon of the watersurface map. The processed watersurfaces_hab.gpkg file is a GeoPackage that contains: watersurfaces_hab_polygons: a spatial layer with the selected polygons that containstanding water habitat types. watersurfaces_hab_patches: a table with information on the habitat types in each watersurface polygon. The R-code for creating the watersurfaces_hab data source can be found in the GitHub repository 'n2khab-preprocessing' at commit 1d732e2.