Radnorshire (22), the least populous of the Welsh counties; lies on the English border between Montgomery (N.) and Brecknock (S.); has a wild and dreary surface, mountainous and woody. Radnor Forest covers an elevated heathy tract in the E.; is watered by the Wye and the Teme. The soil does not favour agriculture, and stock-raising is the chief industry. Contains some excellent spas, that at Llandrindod the most popular. County town, Presteign.