155 



iSSa Island(MHW-Llne) Watershed 



"^f^. Tidal Flal/Shoal(Norderney,Langeoog) 



Seawall, Revetment, Groin o 



Coastllne(Dike, Revetment) '- 



5 10km 



_J I 



Fig. 10.1. East Frisian Islands in 1750 and in 1960 (after Kunz , 1987) 



