Learn how to say Marshes correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word marsh:
an area of low-lying land which is flooded in wet seasons or at high tide, and typically remains waterlogged at all times:
the marsh marigold loves damp fields, riverbanks, and marshes
patches of marsh
Old English mer(i)sc (perhaps influenced by late Latin mariscus ‘marsh’), of West Germanic origin