沼沢|しょうたくshoutaku[0]heiban (flat)

1. nounmarsh; swamp; bog

• Synonym沼ぬまNeutralThe everyday word for a concrete stretch of marsh; also used figuratively for a hobby you get hooked on and cannot escape.
• Synonym沼地ぬまちNeutralMarshland where the mud is deep and the ground stays damp; the everyday way to say it, more colloquial than 「沼沢」.
• Related湿原しつげんNeutralWetland of freshwater-soaked grassland, found in plains and mountains alike, as in 「釧路湿原」; the emphasis is on the grassy landscape.
• Related湿地しっちNeutralA general term for ground that is damp and muddy, whatever the terrain; the usual word in modern ecology, as in 「湿地保護」.
• Related沼沢地しょうたくちWrittenSame meaning as 「沼沢」, with 「地」 stressing the land itself; a written term seen mostly in geography and ecology literature.
• Related沼池NeutralCovers both marshes and ponds, but this is not a word in common use; say 「沼」 or 「池」 instead.
• Related湿地草原NeutralNot an established term: it just describes wet grassland. For this kind of terrain, 「湿原」 is the usual word.
• Antonym乾地WrittenThe antonym: dry land, as opposed to waterlogged, muddy marsh. A written word, and not one in common use.

In everyday speech, say 「沼」 or 「沼地」 for a marsh. 「湿地」 is the word for wetlands in ecology and conservation, and grassy freshwater wetlands are 「湿原」. 「沼沢」 itself turns up mostly in written geographic prose.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 沼ぬまと沢さわ。