marismas
/məˈrɪsməz/noun
Treated as plural. The wetland areas around the mouth of the Guadalquivir river in southern Spain. Also (occasionally) in singular form marisma.
Origin
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.