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Ischia
Ischia ((:ˈiskja)) is a volcanic island in the Tyrrhenian Sea. It lies at the northern end of the Gulf of Naples, about from the city of Naples. It is the largest of the Phlegrean Islands. Roughly trapezoidal, it measures approximately east to west and north to south and has about of coastline and a surface area of . It is almost entirely mountainous, the highest peak being Mount Epomeo at .〔''Princeton Encyclopedia of Classical Sites''〕 The island has a population of over 60,000 people.
Ischia is the name of the main ''comune'' of the island. The other ''comuni'' of the island are Barano d'Ischia, Casamicciola Terme, Forio, Lacco Ameno and Serrara Fontana.
The main industry is tourism, centering on thermal spas that cater mostly to European (especially German) and Asian tourists eager to enjoy the fruits of the island's natural volcanic activity, its hot springs, and its volcanic mud.
==Geography==
The roughly trapezoidal island is formed by a complex volcano immediately SW of the Campi Flegrei area at the western side of the Bay of Naples. The eruption of the trachytic Green Tuff ignimbrite about 56,000 years ago was followed by caldera formation. The highest point of the island, Monte Epomeo (788 m), is a volcanic horst consisting of a Green Tuff ignimbrite deposit that was submerged after its eruption and then uplifted. Volcanism on the island has been significantly affected by tectonism that formed a series of horsts and grabens; at least of uplift has formed as a result of resurgent doming during the past 33,000 years. Many small monogenetic volcanoes were formed around the uplifted block. Volcanism during the Holocene produced a series of pumiceous tephras, tuff rings, lava domes, and lava flows. The latest eruption of Ischia, in 1302, produced a spatter cone and the Arso lava flow, which reached the NE coast.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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