English: Location map for the list of selected tide ranges on southern North Sea, timelines of the tide waves (three synchronous amphidromic circles), coastal marshes (green), mudflats (jade), lagoons (bright blue), dunes (yellow), sea dikes (purple), moraines near the coast (light brown), rock-based coasts (grayish brown)]]
Deutsch: Lokalisationskarte für die Liste ausgewählter Tidenhübe an der südlichen Nordsee, Flutstundenlinien der drei synchron rotierenden Tidenwellen, Küstenmarschen grün, Watt blaugrün, Lagunen leuchtend blau, Dünen gelb, Seedeiche purpur, küstennahe Geest hellbraun, Küsten mit felsigem Untergrund (Tertiär und älter) graubraun
Frank Ahnert, Einführung in die Geomorphologie, 4th edition. 2009, Ulmer UTB, ISBN978-3-8252-8103-8, p. 329, fig. 25.2., from King, C. A. M., Beaches and Coasts, 2nd edition. 1972, St. Martins Press, London
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