Inishowen (Irish: Inis Eoghain, meaning "Island of Eoghan") is a peninsula in County Donegal, Ireland. It is also the largest peninsula in all of the island of Ireland. Inishowen is a picturesque location with a rich history. The peninsula includes Irelands' most northerly point, Malin Head, along with Lagg sand dunes, some of the highest in Europe, as well as Grianán an Aileach, a royal fort constructed by the Clan Uí Néill in the sixth century. The Grianán stands at the entrance to the peninsula.