Fenland is an area of low-lying marshy land in the east of England. It is mainly located in the counties of Lincolnshire, Cambridgeshire and Norfolk. The term 'Fenland' is derived from the Old English word fenn, meaning MARSH or bog. The marshy land is often used for agricultural purposes, such as grazing and growing crops. The area is also home to a variety of wildlife, including birds, fish, and other animals. The crossword solution MARSH is an appropriate description of Fenland, as it is a type of wetland characterized by its marshy nature.