A spatial compilation and visualization of loess parameters was carried out for the Pleistocene loess and loess-like sediments in the Weser-Aller catchment (southern Lower Saxony and northern Hesse, NW Germany), one of the loess regions of Central Europe. As far as available, data about main loess characteristics like thickness, granulometry and stratigraphy were combined for the first time with spatial information extracted from maps. Data storage and analysis in a geographical information system (GIS) permitted creation of large-scale thematic loess maps. The loess thickness map displays an increase of the thickness in valleys and basins and from north to south. The granulometry map presents main granulometrical facies types of the loess cover. Furthermore, several loess locations with unusual thickness were identified and their special geological and geomorphological conditions are discussed. In summary, the loessic sediments in the northern part of the study area are of Upper Weichselian age, whereas in the southern upland regions incomplete or detailed Weichselian loess sequences were identified. In conclusion, highly detailed maps of regional loess-property patterns can be created even if only heterogeneous historically published data are taken into account.