The dataset represents an index layer showing the geographic extent of geological maps of Greenland printed and published by the Geological Survey of Greenland (GGU) and the Geological Survey of Denmark and Greenland (GEUS) since 1957. The layer functions as a search and reference tool and does not contain the original map material. The dataset provides direct links to the GEUS Dataverse, where each map is assigned a DOI and can be downloaded as high-resolution TIFF images (400 dpi) or PDF files.

Areas of special drinking water interest (OSD) are assigned the highest priority for drinking water supply. They are delineated according to criteria including future water demand, groundwater quality, natural protection, and the preservation of existing abstraction infrastructure. The spatial extent of OSD areas may be adjusted as new knowledge becomes available through fee-financed groundwater mapping under the Environmental Objectives Act § 8a. Within these areas and abstraction catchments for public waterworks, action plans are developed under Chapter 3 of the Water Supply Act. Areas of drinking water interest (OD) represent regions with groundwater of suitable quality for drinking water, primarily relevant for smaller utilities and local abstraction. The data are provided as a vector Dataset and are accessible via OGC web services. Source data are obtained from the Danish Environmental Protection Agency’s groundwater delineations (as of November 2022) and reflect the state of knowledge at publication time.

The dataset represents a nationwide mapping of buried valleys in Denmark. The map depicts the occurrence, distribution and general geometry of mapped buried valleys in the Danish subsurface. Buried valleys are elongated depressions in the subsurface that are today fully or partly infilled with younger sediments. In Denmark, the majority of mapped buried valleys are interpreted to have formed during repeated glaciations in the Quaternary period. The valleys are typically 0.5–2 km wide and may reach depths of up to approximately 400 m. The dataset is based on interpretation of geophysical data, primarily TEM and SkyTEM surveys, supplemented by seismic data and borehole information. The mapping provides a national overview of buried valleys and forms a key basis for understanding the geological framework of the subsurface.