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All answers having "Historic waterway." as clue:

4 Character Answers:

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ERIE

NILE

SUEZ



5 Character Answers:

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VOLGA



6 Character Answers:

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REDSEA



9 Character Answers:

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NILERIVER



10 Character Answers:

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STLAWRENCE



14 Character Answers:

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ENGLISHCHANNEL



15 Character Answers:

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STLAWRENCERIVER