| Then there was the little one...
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The Symplegades, also known as The Clashing Rocks, are an entrance into The Sea of Monsters.
Annabeth Chase suggests using the Clashing Rock to enter the Sea of Monsters, instead of going between Scylla and Charybdis. Clarisse La Rue rebuffs the idea, saying, "I can't blow rocks apart with my cannons. Monsters, on the other hand..."