Rungholt

thumb|North Frisian coastline before 1362 thumb|The island of Strand (island)|Strand after the Grote Mandrenke (Danish: Den Store Manddrukning) with German and Danish place names thumb|Rungholt and Strand in the Middle Ages, on a map from 1850 Rungholt was a low-lying settlement in North Frisia, in what was then the Danish Duchy of Schleswig. The area today lies in Germany. Rungholt was flooded, with massive erosion, when a storm tide (known as Grote Mandrenke or Den Store Manddrukning) hit the coast on 15 or 16 January 1362.