garganta de los infiernos natural reserve, extremadura, spain

semiexcavated path rock runs parallel river garganta infiernos natural reserve extremadura spain granite slabs pathway handrail footpath jerte upper riverside flood steps trekking trail track early autumn season hells gorge nature southwestern side tornacavas cabezuela del valle mountains green cold waters gneiss hydrographic network pilones giant potholes erosion travel sierra tormantos gredos valley attraction space hills blue sky