ABERYSTWITH, a market-town of Cardigan-shire, in Wales, seated on the Ridal, near its confluence with the Ilftwith, where it falls into the sea. It was formerly a walled town; and fortified with a castle, which is now in ruins; and the town itself is gone to decay, for there is scarce a hundred houses remaining. However, it is governed by a mayor and recorder; and sends one member to parliament. It is noted for its fishing trade, and has a good market on Mondays for corn and wool. Its distance from London is 199 miles west-south-west. W. Long. 4. 15. Lat. 52. 30.