or BUALT, a market-town of South Wales, county of Brecknock, 12 miles S.W. of New Radnor, pleasantly situated on the Wye, here crossed by an excellent bridge of six arches. It consists of two narrow, ill-formed streets, running nearly parallel to each other, and forming irregular terraces on the side of an acclivity rising from the river. On account, however, of its fine situation, and the salubrity of its air, it is much frequented. At the east end of the town are some remains of a castle, said to have been erected in the eleventh century by Bernard Newmarch, lord of Builth. About a mile and a half N.W. of the town are three mineral springs—a saline, a sulphurous, and a chalybeate. Market-day Monday. Pop. (1851) 1158.