Valladolid is an industrial city and it is a municipality in north-central Spain, upon the Rio Pisuerga and within the Ribera del Duero region. It is the capital of the province of Valladolid and of the autonomous community of Castile and Leon, therefore is part of the historical region of Castile. The most probable origin of the term is Latin: VALLIS, "Valley"; and Celtic: TOLITUM, "place of confluence of waters" And it also means "city in a cloud" The name is also linked with the Arabic name for the city بلد الوليد meaning The City of Walid. It is also popularly called Pucela, a nickname whose origin is not clear, but probably refers to a few knights who accompanied "Juana de Arco".