As nouns the difference between marshland and grassland
is that marshland is marshy land; bog or fen while grassland is an area dominated by grass or grasslike vegetation.
marshland
English
Noun
(-)
marshy land; bog or fen
grassland
English
See also
* llano
* meadow
* outback
* pampa
* paramo
* prairie
* savanna
* steppe
* veld