Many times these may be defined differently based on dialect.  Fens are in England.  Swamps are usually fresh water because they are inland and marshes are usually salt water because they are on the coast.  Swamps usually have trees and Marshes have grass.  A bog is an area that has growth which has hidden the water.

Okefenokee Park

Swamp Okefenokee Park

salt marsh




Redgrave and South Lopham Fen

Fen Redgrave and South Lopham






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