Dear Professors:
 
Here is a sentence I read days ago.
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Today tropical swamps and marshes are undergoing the most rapid
accumulation of peat, with rates in Borneo of 17m in 4000 years.
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I wonder how to distinguish the "swamp " and "marsh" here.  As I know they
are all different kinds of geographical phenomena ( but quite similar ) in
this sentence. But they are of the same meaning according to my dictionary
( wet and lower land or the land with shallow water and grass ). Could you
tell me what is the tiny difference?
 
TIA
 
Tianyi