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.
[1] At the time, Hainshallig was leased to a Hooge resident as part of a leasehold estate and was used for the production of hay.
[2] A levee may have once led from Hooge to Hainshallig.
[3] The area belonged to the Duchy of Schleswig, which was a fiefdom of the Danish crown, now Germany.
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