Citations:Halligen


 * 2021, Sophie Hardach, https://www.bbc.com/future/article/20210216-the-islands-that-protect-germany-from-the-north-sea, Future Planet, (17 February 2021);
 * Hartwig-Kruse's family has been living with "land under" since her first recorded ancestor arrived on Nordstrandischmoor in 1717. The island is one of 10 Halligen – unique sea-level islands off Germany's North Sea coast. Typically, they are not protected by dykes, leaving them exposed to floods, especially in winter. The largest two, Langeness and Hooge, are home to about 100 people; the smallest, Gröde, to only 10.
 * In the past, violent storm floods split or even drowned entire Halligen.