Bluff (Canadian prairies) should not be confused with Bluff (geography).
A bluff is a Canadian English term used on the Canadian Prairies to indicate a clump of trees on the prairies, usually poplars or willows.[1] A bluff is naturally occurring, not cultivated.
A bluff of trees normally occurs on the flat lands. "Bluff" in this sense is different from the geographical term "bluff", meaning a cliff.