swamp / marsh / bog / fen

Dear all,

Wetlands can be classified in 4 different categories: Swamps, marshes, bogs and fens.

However, when I try to find a french equivalent for each of them, I always end up with "Marais/Marécage".

Surely, the science of humid biomes must find its way into the language of Voltaire...

Does someone know an appropriate translation for each of these words?

Thank you
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