It is located in the Esla River and in 1994 this area was declared Regional Park, since ecosystems own of the Euro-Siberian region are preserved, with extensive areas of Atlantic forest which are characterized by oak and beech forests and a fauna in which the presence of the brown bear and the grouse is highlight; giving this environment great natural and landscape values.
The construction of the reservoir of Riano began in 1965, although certain social and political circumstances delayed its opening until late 80.
