garganta de los infiernos natural reserve, extremadura, spain

jerte river winding valley curves meander garganta infiernos natural reserve extremadura orography scenery sloped watercourse weaving hillsides vertical spain runs mountains viewpoint upper early autumn season travel sierra tormantos gredos attraction idyllic beauty spot space hells gorge nature southwestern side tornacavas cabezuela del valle chesnut forests waters hydrographic network