The wall that was built to prevent the Persian from advancing in large numbers along the coast is known as Hexamilion Wall.
- This wall was built during the Persian invasion of Greece.
- It was originally constructed to block the only land route that leads to the Peloponnese peninsula from mainland Greece.
- It was constructed around the Isthmus of Corinth during the period of 408 AD and 450 AD
Hence, in this case, the correct answer is "Hexamilion Wall."
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