Europe's primary biogeographical zones, showing the northern limit of vine cultivation in late antiquity, the olive-growing regions, and areas of fertile loess soils. Sources: 1:10m Natural Earth II datasets from Natural Earth EU Natura 2000 datasets (2016 edition) Chorological data for the main European woody speciesfrom Figshare Geodata of European loess domains from the Collaborative Research Centre 806 Donald Matthew, Atlas of Medieval Europe (Equinox, Oxford, 1983)