A wetland area is an area of land that is saturated with water, either permanently or seasonally. It can include fens, marshes, bogs, and swamps. Fens are wetlands that are fed by groundwater and have alkaline soils, while marshes are wetlands that are fed by surface water and have neutral or acidic soils. Bogs are wetlands that are fed by precipitation and have acidic soils, and swamps are wetlands that are fed by both surface water and precipitation and have neutral or acidic soils.