a large town of Ireland, in the county of Londonderry and province of Ulster; seated on the river Bann, four miles south of the ocean, in W. Long. 7° 2'. N. Lat. 55° 10'. It was formerly a place of great consideration, being the chief town of a county erected by Sir John Perrot, during his government of Ireland; whereas it is now only the head of one of the baronies in the county of Londonderry; but it is still a corporation, and sends two members to parliament. It is of a tolerable size, and very elegantly built. The port is very indifferent, occasioned by the extreme rapidity of the river, which repels the tide,