Over a short stretch of the outer dike, the route leads through the East Frisian marshland and the village Hamswehrum to Groothusen. The East Frisian "chieftain's castle" Osterburg with a view of the dike lies three metres above sea level.
The more than 530-year-old castle is one of the oldest secular buildings in East Frisia. During a guided tour you can learn about the historical peculiarity of the stone house and its past on the Wadden Sea.
Friends of homemade cuisine and creative cakes and tarts will get their money's worth in the charming bistro and café. Enjoy the enchanting castle garden with a view of the castle.