Hainshallig (also spelled Hayenshallig) was a small Hallig in the North Frisian Wadden Sea, located east of the Hallig of Hooge, that was flooded and sank in 1860. At the time, Hainshallig was leased to a Hooge resident as part of a leasehold estate and was used for the production of hay. A levee may have once led from Hooge to Hainshallig. The area belonged to the Duchy of Schleswig, which was a fiefdom of the Danish crown, now Germany.
- Röhr, Hanswerner. "Die Halligen an der Westküste gelten vorerst als sicher" (PDF). Berichte und Geschichte aus Husum und Umgebung (in German).
- Ersch, Johann Samuel (1833). Allgemeine Encyclopädie der Wissenschaften und Künste in alphabetischer Folge (in German).
- Hanssen, Georg (1884). Agrarhistorische Abhandlungen. 2.
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