garganta de los infiernos natural reserve, valle del jerte, spain

pilones pool infiernos garganta natural reserve jerte caceres extremadura spain geology erosion valley river water freshwater stream flowing tranquility relaxation biodiversity biology ecosystem environment forest tourism tree park parkland wildlife conservation observation no people beauty in nature environmental eco nonurban scene outdoors tranquil green colour landscape scenery scenics woodland variegated foliage idyllic trunk climate change