Powys (pōˈĭs) [key], county, 2,009 sq mi (5,204 sq km), E central Wales. The terrain is a network of lowlands, highlands, and connecting plateaus. Agriculture is economically important, as are sheep and cattle raising. There are some light and service industries. Named after the Welsh princedom, Powys peaked as a vital region in the 12th cent. Tourists are attracted to the 8th-century Offa's Dyke, a feature within the landscape, and to the remains of numerous Norman castles.