In the world of Shadowrun, Tír na nÓg is the name of one of the two major elven states founded after the awakening, Tir Tairngire in North American being the other. It consists of the entire island of Ireland and is not popular with the megacorporations, because it does not accept corporate extraterritoriality. The entire island is surrounded by a magical barrier called The Veil, which keeps out everyone who's not specifically allowed to come in.