The highway to the Forest of Oza shows beautiful landscapes to us and our attention has to stop unavoidably to the height of the Mouth of Hell. It is a this one deep throat excavated by the Aragón-Subordán in his impetuous spirit to cross the Mastiff Mountain range of and the bulk of End Agüerri and Bisaurín.
The oaks and oaks, rather Mediterranean plants, as well as the linden trees and maples, have been replaced here by the continuous presence of are and wild firs, as well as of birches and some pines.
The narrowness of the valley causes that the sun hardly arrives at the plants located in its bottom and this, together with the existence of a thermal investment, causes that we enter an own Atlantic forest of the European, the hayedo-fir wood. Exceeded the camping San Juan de Dios, the valley is opened abruptly: we have arrived at Oza.
WAY OF THE IBON (LAKE) OF ESTANES
Part of the march to Estanes can become in vehicle by a track at the summer time.
When We arrived at the cantelera by a highway in badly been we have left back already a dream hayedo-fir wood, then the river runs with haste by its channel. One of the last inhabitants of the Pyrenees, the brown bear, still tries to survive with great difficulty in the forest masses that now surround defying the ghost to us by the extinction. It is left before us one long track that in winter can be, like no, a pretty itinerary in skis.
The end of the spring and the month of July will allow to discover the unimaginable beauty us of plants such as the digitalis or the iris and with luck reptar of a smooth snake or a viper áspid, particularly abundant in this valley, will fill to us of astonishment.
Also the common and parteros toads are exceptionally frequent here, as well as the salamander.
To the right overcoming the track the rest of the old hayedo of Guarrinza have left as a sample of which it was.
Back and to the other side of the river the quartering of the Mine, more ahead the White Mallo. In the level of the 1,500 m.s the track finishes, up to here one hour and average approximately from Oza. The verdor of the valley, its morphology glacier and other aspects that are discovered on the march cause that the route on foot has been worth the trouble.
At the end of the track a quite direct footpath, but cuts, takes us to the entrance of the valley that is cradle of the Aragon-Subordan,
Aguas Tuertas, a valley in trough, that is to say, a valley glacier that has been filled up by sediments, with which the tame river loss forming meanders:
they are the waters "twisted" or Aguas Tuertas.
In order to direct to us to Estanes we will have to cross it in all its length until the left end of the valley, times jumping the river, others stepping on the backing grass or the snow what still remains.
In spring we will discover in this place one of the most extraordinary pictures of the Pyrenean one, a vision will be opened to us before the eyes multicolor where very varied flowers and the grass that wakes up are the people in charge of so idyllic landscape.
It is worth the trouble to make a shutdown here to discover an ecosystem of great interest in the mountain, the alpine peat bog. The grass along with the water that is backed up gives form to this Pyrenean ecosystem rich represented in the most humid one and than it supports an enormous biological wealth, from almost microscopic artrópodos to the alpine bisbita ribereño, typical bird inhabitant of the pastizales of mountain, happening through amphibians like the red frog, protected species.
Soon after taking the subvalley in direction This, that would lead to us to France by the Port of Gabedaille, it leaves towards the right a footpath that will overcome until Estanés being this one the hard part to us rnás of our itinerary. The passage of valley Tuertas the Water up to here will cost approximately one hour to us in level land, but rnás if to entertain us to us with the vision of the rotten birds in the search of some dead head of cattle and among them we can still discover to another one of the peculiarities that zealously guards much the Pyrenean one: the quebrantahuesos much more agile that its same types the leonados vultures or alirnoches.
The footpath will lead between prairies and rocks during one hour and average or two hours to us to the stop of the Ibón de Estanés to 1,920 m.s by the Cabretas. This he is biotopo more appropriate to give with the birds of the heights: alpine acentores, alpine, bisbitas sparrows and perhaps some treparriscos. Also, if the luck smiles to us, the nivales perdices can be seen, true alive resquicios of the quaternary glaciarismo that have been isolated in our mountains.
To the arrival on the Ibón de Estanés the vision is magnificent, will seem to us to have reached a high summit, although the height is modest - hardly 1,900 m.s -. We will have extensive a panoramic one on French valleys, and like no, the Midi will do of bottom drop curtain. Down, Estanés, also an important ecosystem of the pirenaico frame, although unfortunately is not a this place type. By a side its represamiento for hydroelectric advantage of France, and by another one the introduction of the trout on the part of the French, which does that its fauna you gave much of being the original one, endemic pirenaico Triton, typical inhabitant of ibones, entered hard ecological competition with the voracious ones salmonidos, reason why he was displaced.
Taken from the book "the nature in the mountain. 15 itineraries by Aragón".
Aragonese federation of Montañismo, PRAMES and General Delegation of Aragón.
Zaragoza, 1992. 4ª Edition. Text of Javier Sampietro.
The information will not be complete without a stroll by its three provinces: Zaragoza, Teruel and Huesca ans us varied Regions, with shutdown in some of its spectacular landscapes like Ordesa or the Moncayo or by opposition in the valle of the Ebro.
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