Low-lying wet land is a term used to describe an area of land that is close to sea level and is often wet or marshy. A MARSH is an area of low-lying land that is flooded with water, either permanently or seasonally, and is home to a variety of plant and animal species. Marshlands are important ecosystems that provide habitat for many species of birds, fish, and other wildlife. They also help to protect coastal areas from flooding and erosion.