The Western valleys Natural park, the most occidental park of the aragonese Pyrenees, is constituted by the valleys of Aísa, Borau, Aragüés-Jasa, Hecho and Ansó. Beside France, it shows varied contrats, caused by the antlantic influence from the north and the mediterranean from the south. The top of the valley is made up of the valleys of Igüer and Rigúelo, where the fields and the black pine prevail in the landscape, with the background of its colossus (the Aspe, the Llana de la Garganta and the Llana del Bozo) and the lecherines peaks. Hiking beside the river or climbing to its summits you could meet with the lammergeiers, yellow and red billed choughs, the vultures, the real eagles, snowfinchs or some lively wallcreepers….Also you will be surprised by the strident whistle of the marmots and the chamoises jumps between the rocks. As we go down following the Estarrún river, the beeches woods and the wild pines will offer different changing shapes, from the lively color of the leafs that sprout out in spring, until the lead red color of the autumn, herald of the winter introspection. The tapping of the black woodpecker will accompany you in your walks in the Abi beeches wood or the Sibiscal pines wood, and the songs of the great tit, the blue tit or the citril finch will make unforgeteable a walk through these charmings woods. The Estarrún river will increase until it arrives to the small but beautifull town of Aísa, where Estarrún B&B settled to host and advise you in your visit to this unique corner of the Pyrenees.