Euboea is an island of Greece. It is also one of the 51 prefectures of Greece. Euboea is the second largest island of Greece. Its total area is 3,655 km². It is to the east of Boeotia and Attica prefectures. The island is surrounded by the Aegean Sea. The capital of Euboea and the biggest city on the island is Chalkida.

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