At some points in the poem the verses could reflect some part of Frodo and Sam's experience in the Dead Marshes on the approach to Mordor.
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And slow and softly rings their bell,
As in the slime you sink.
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Quote:
By a dark pool's borders without wind or tide,
Moonless and sunless, the Mewlips hide.
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Quote:
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With single sickly candle lit...
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If the 'source' of that poem was Sam, maybe the Marshes inspired him, at least.