Marish, meaning a marshy or swampy area, has a number of synonyms that can be used to describe similar landscapes. These include bog, fen, polder, quagmire, and morass. A bog is a wetland that is acidic and dominated by peat, while a fen is a type of wetland that is fed by mineral-rich water sources. A polder is a low-lying area of land that has been reclaimed from the sea or a river delta. A quagmire describes a particularly mushy and difficult to navigate section of land, while a morass is a confusing and tangled web of marsh and swamp. All of these words can be used interchangeably with marish to describe wetland areas.