Marshy soil is a type of soil that is found in WETLAND areas. It is characterized by its high water content, which makes it very soft and muddy. The term marshy soil is often used interchangeably with the term WETLAND, which is an area of land that is saturated with water, either permanently or seasonally. Marshy soil is important for providing habitat for many species of plants and animals, as well as helping to filter pollutants from water sources.