Editing Guadiana (section)

===Sources===
The exact source of the river  in Castilla-La Mancha is disputed, but it is generally believed to spring in the {{ill|Ojos del Guadiana|es}}, [[Villarrubia de los Ojos]] municipal term, [[Ciudad Real Province]], Castile–La Mancha, about {{convert|608|m|ft}} in elevation.

A classic theory introduced by [[Pliny the Elder]], was that the river originated from the [[Lagunas de Ruidera]] and divided into two branches: the Upper Guadiana ({{langx|es|Guadiana Viejo|links=no}}) and the Guadiana, while separated by a subterranean course. This legend developed from a misguided belief (which persisted until the 19th century) that the river appeared and disappeared over time, because of its subterranean tributary. In fact, no subterranean course exists, and the belief that the Lagunas de Ruidera is the source is also controversial. toponymically and traditionally the Upper Guadiana,<ref>José Díaz-Pintado Carretón, 1997</ref> which runs from [[Viveros]] ([[Albacete]]) until [[Argamasilla de Alba]] ([[Ciudad Real]]) had been identified as the main branch of the Guadiana. But even hydro-geological characteristics indicate that the Upper Guadiana may not be the principal river within the system.<ref>A. Cabo Alonso, 1991</ref>

Another of the origin theories, postulated that the [[Cigüela River|Cigüela]] and [[Zancara River|Záncara]] rivers were the sources of the Guadiana. Today, they are considered integral parts of the river's headwaters and important tributaries, but not necessarily the exact origin. The Ciguela's source is in Altos de Cabreras ([[Cuenca Province (Spain)|Cuenca]]) and pertains to the [[Sistema Ibérico]], at an elevation of {{convert|1080|m|ft}}. Its course is {{convert|225|km|mi}} long, receiving contributions from the rivers Jualón, Torrejón, Riánsares, Amarguillo and [[Záncara]]. The union of the rivers Ciguela and Záncara permits the replenishment of the waters in the [[Tablas de Daimiel National Park]], a wetland that was designated for protection by the Spanish government in 1973 (situated in the municipalities of Villarrubia de los Ojos and [[Daimiel]], in the province of Ciudad Real).