Ischia is a volcanic island in the Tyrrhenian Sea. It lies at the northern end of the Gulf of Naples, about 30 kilometres from the city of Naples. It is the largest of the Phlegrean Islands. Although inhabited since the Bronze Age, as a Greek emporium it was founded in the 8th or 9th century bCE, and known as Πιθηκοῦσαι, Pithekoūsai.

The Tyrrhenian Sea is part of the Mediterranean Sea off the western coast of Italy. It is named for the Tyrrhenian people identified with the Etruscans of Italy.