Ischia is a town and one of the six comuni on Ischia island, in the Tyrrhenian Sea. With a population of about 18,000, it is the largest settlement on the island.
The town is formed by two distinct boroughs, called "Ischia Porto" and "Ischia Ponte". The latter was named after an ancient wooden bridge (in Italian language, ponte) which, until the 18th century, connected it to the Aragonese Castle.