Translation guide
A swamp is a wetland with trees and standing water. In Japanese, the most common word is 沼 (numa), but there are other terms depending on size, vegetation, and context.
A wetland area with standing water and vegetation, often smaller than a lake.
The most common and general word for swamp, marsh, or bog. Can refer to any small to medium-sized wetland.
この沼にはワニがいる。
There are alligators in this swamp.
沼の水は濁っている。
The swamp water is murky.
A broader term for wetlands, including swamps, marshes, and bogs. Often used in environmental or scientific contexts.
この湿地は保護区域に指定されている。
This wetland has been designated a protected area.
Swampy land or marshland. Emphasizes the land itself rather than the body of water.
沼地を歩くのは危険だ。
Walking through the swamp is dangerous.
A mountain stream or swampy area in a valley. Often used in place names.
山奥の沢で珍しい植物を見つけた。
I found a rare plant in a mountain swamp.
A vast, often grassy wetland, like the Everglades.
Literally 'big swamp'. Used for large swamps or lakes, often in proper names.
大沼公園は観光地として人気がある。
Onuma Park is popular as a tourist spot.
A marshland or wetland plain, often extensive and grassy. Common in Hokkaido place names.
釧路湿原は日本最大の湿原です。
Kushiro Marsh is the largest marshland in Japan.
A situation that is overwhelming, difficult to escape, or bogged down.
Literally 'mud swamp'. Used figuratively for a quagmire, a messy or inescapable situation (e.g., a bad relationship, a scandal).
彼は借金の泥沼にはまっている。
He is stuck in a swamp of debt.
その問題は泥沼化している。
The issue has turned into a quagmire.
To get stuck in a swamp; figuratively, to become obsessed with something (often a hobby or fandom).
彼女はアイドル沼にはまっている。
She's fallen into the idol swamp (she's obsessed with idols).
沼 (numa) is the everyday word for a swamp or pond-like wetland. 湿地 (shicchi) is a broader, more technical term for any wetland. 湿原 (shitsugen) refers to large, grassy marshlands, often used in proper names like 釧路湿原 (Kushiro Marsh).
In modern slang, 沼 (numa) is used to describe an obsession or hobby that you can't escape from, similar to 'rabbit hole' in English. 沼にはまる means to get deeply into something.