Editing Castile and León (section)

====Lakes and reservoirs====
[[File:007333 - Provincia de Zamora (8707601613) edited.jpg|thumb|Of glacial origin, the [[Sanabria Lake]] is the largest natural freshwater lake in Spain.<ref>{{Cite journal|journal=Limnetica|volume=8|issue=1|url=https://www.limnetica.net/documentos/limnetica/limnetica-8-1-p-49.pdf|year=1992|title=The Sanabria Lake. The Largest Natural Freshwater Lake in Spain|page=49|first1=J. C.|last1=Vega|first2=C. de|last2=Hoyos|doi=10.23818/limn.08.05|first3=J.J.|last3=Aldasoro}}</ref>]]
In addition to the rivers, the Douro basin also hosts a large number of lakes and lagoons such as the [[Negra de Urbión Lake]], in the [[Picos de Urbión]], the [[Grande de Gredos Lake]], in Gredos, the [[Sanabria Lake]], in Zamora or the [[La Nava de Fuentes Lake]] in Palencia. Also emphasize a great amount of reservoirs, fed by the water coming from the rains and the thaw of the snowy summits. Thus, Castile and León, despite not having abundant rainfall, is one of the communities in Spain with the highest level of water dammed.

Many of these natural lakes are being used as an economic resource, boosting rural tourism and helping to conserve ecosystems. The Sanabria Lake was a pioneer in this.