Peat bog is a term used to refer to an area of wetland where peat has formed or is forming. Synonyms for peat bog include peatland, mire, quagmire, swamp, and bogland. Peatland is a generic term that refers to a wetland that comprises peat and is composed of dead plant material, mainly mosses, that accumulate over time. Mire is a term used to describe a spot that is wet and muddy. Quagmire refers to an area of soft, muddy ground that gives way underfoot. In contrast, swamp and bogland refer to wetlands that are typically covered with water.