Inishowen (Irish: Inis Eoghain) is a peninsula in County Donegal, and the largest in Ireland. Predating the formation of Donegal by centuries, the area was named Inis Eoghain (the Island of Eoghan) after Eoghan, son of Niall of the Nine Hostages (Niall Naoigeallach, a High King of Ireland), whose name was also used for Tyrone (Irish: Tír Eoghain).
Historically the Inishowen area also includes the area of County Derry to the west of the Foyle river, including the city of Derry.
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