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All answers having "Swamps" as clue:

4 Character Answers:

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BOGS

FENS



5 Character Answers:

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MIRES



7 Character Answers:

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ENGULFS

MARSHES



8 Character Answers:

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MORASSES

WETLANDS



9 Character Answers:

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INUNDATES

QUAGMIRES



10 Character Answers:

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MARSHLANDS