ANTRIM, a town, County Antrim, Northern Ireland, in a valley half a mile from Lough Neagh. Pop. (1926) 1,979. Near the town is one of the most perfect of the round towers of Ireland, 93ft. high and soft. in circumference at the base, which may per haps have been a protection against the Scandinavians who made Lough Neagh one of their bases. Antrim Castle also testifies to the strategic advantages of the site, which in more peaceful times led to the rise of a small market town, with manufactures of paper, linen and woollen cloth, commanding important routes. The town now has railway communications with Belfast, Larne, Cole raine and other important centres.