Ischia ( Pron. "Ee-skee-ah") is a volcanic island in the Tyrrhenian Sea, at the northern end of the Gulf of Naples. The roughly trapezoidal island lies about 30 km from Naples and measures around 10 km east to west and 7 km north to south with a 34 kilometres (21 mi) coastline and a surface area of 46.3 square kilometres (17.9 sq mi). It is almost entirely mountainous, with the highest peak being
Mount Epomeo at 788 meters.
Reportedly it is the site of an entrance into the subterranean world.
