Definitions of marsh:

• noun:   low-lying wet land with grassy vegetation; usually is a transition zone between land and water

  Example: "Thousands of acres of marshland"

• noun:   New Zealand writer of detective stories (1899-1982)
• noun:   United States painter (1898-1954)
• name:  A surname (common: 1 in 4000 families; popularity rank in the U.S.: #457)