The Guadiana watershed extends in Castilla–La Mancha, 37 percent of that river's entire watershed, with a population of 583,259 inhabitants. It includes the southern part of the province of Toledo, nearly all of the province of Ciudad Real (except the very south), the southwest of the province of Cuenca and the northwest of the province of Albacete. The Guadalquivir watershed extends over 5.2 percent of the surface area of the autonomous community, extending through the southern parts of the provinces of Ciudad Real and Albacete, including such important population center as Puertollano.