noun, feminine/maˈɾisma/plural: marismas
saltwater marsh, tideland marsh
“Rápidamente se encontró en las orillas de una marisma, cargada de flexibles juncos.”
Related: cocodrilo de las marismas, marismeño
Ultimately from Latin maritima, feminine of maritimus. Considering the Spanish word's /s/ and /i/, likely borrowed via Mozarabic. Compare Portuguese marisma, Catalan maresma, Italian maremma.