Wordnet 3.0
NOUN (1)
1. 
 low-lying wet land with grassy vegetation; 
 usually is a transition zone between land and water; 
- Example: "thousands of acres of marshland"- Example: "the fens of eastern England"[syn: marsh, marshland, fen, fenland]
WordNet (r) 3.0 (2006):
fenland
    n 1: low-lying wet land with grassy vegetation; usually is a
         transition zone between land and water; "thousands of acres
         of marshland"; "the fens of eastern England" [syn: marsh,
         marshland, fen, fenland]