One of the mysteries of the English language finally explained.
Treated as plural. The wetland areas around the mouth of the Guadalquivir river in southern Spain. Also (occasionally) in singular form marisma.
Late 19th century. From Spanish marismas, plural of marisma marsh, wetlands, applied to a specific region in Andalucia, apparently a Mozarabic form from post-classical Latin maritima coastal region.
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