What is Grunting Fen Made of?

From Fallen London Wiki
A player-created Guide is available for this content: Embarking on a Voyage of Scientific Discovery (Guide)

How are the above links here?

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This page contains details about Fallen London Actions.
Do you dare to dig on an island that might be able to talk back?

Unlocked with Orthos is Coming! 4-5

Storylet appears in Grunting Fen

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What manner of things live here?
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Try some beach-combing instead