Fig. 1

Locations of the Japsand and comparative sites (Helgoland, Schobüll and Bay of Tümlau) in the German North Sea (a). Location of the individual stations in the study area (b). The outline of the Japsand represents the mean high water level. The map was drawn after satellite images from 2019 and the geological map of Schleswig Holstein (1:250 000, ed. 2012 © Landesvermessungsamt Schleswig–Holstein) and personal observations