This valley is inserted as a wedge among the Hecho valley and Aísa. Even being very tiny (about 20 Kms. of development) it has all the own characteristics of the Pyrenees and until it has the highest summit in the Western Pyrenees: the Visaurín (or Bisaurín) with 2.688 m.. It is exceptionally a place calm.
The dividing one with the Hecho Valley begins in the Sierra Bernera to continue toward the S.W. for the Puntal de Secús (2.440), collada de Secús (2.348), Visaurín (2.688), Alto Foratón (2.156) y Sierra de Maito (1.713). In the opposed slope, it is separated of the Valley of Aísa by a mountain-chain that, from the pick of Ruabe (2.425) in the Sierra de Aísa, it lowers toward the South for the Sierra de la Estiva (2.361), Cucuruzuelo (1.973), Puntal de Cotín, Loma de Aísa, Ártica de la Virgen (1.286) y Sierra de Luesia. To the North they form their head and dividing the circus that define: Visaurín, Puntal de Secús (2.440), Sierra Bernera, (that in the pick of Portaza reaches the 2.377 m.) and the pick of Ruabe (2.425). The axis of the valley constitutes it the Osia river that travels from N.E. to S.W. and it is formed next to the Saltieto bridge at expense of the ravines of Articusa (that lower of the hill of the Bozo) and of Cuangas; the river ends up converging with the Aragón-Subordán one, next to Santa Isabel's hermitage (8 km. under Hecho).
The highest part in the Valley is known as VALLE DE LIZARA and their places are covered with dense pine forests and fir, on those that emerge typical escarps of these calcareous mountains; it is included in the National Reservation of the Valleys. In the high plain of the Llano de Lizara, the river throws quick with its first and scarce waters, furrowing an earth of prehistoric discoveries, with an importamte dolmen in the center, visible at a considerable distance. Some paths lead for the Valle de los Sarrios to the Lagos de Cantal and the Ibón de Estanés, already in the border line. The Valley, has two population nucleus: Jasa and Aragüés del Puerto.
* JASA is located 944 m. of height on a hillockin the left riverbank of the Osia, in the western hillside of de Virgen del Ártica, where it offers a beautiful view, with the spread village and the backdrop of the high summits that close the Valley. Of the urban helmet it leaves a hint that, after crossing the dividing one for the Loma de Aísa, passes the neighbor Valle de Aísa, uniting to the highway that travels it and another that ascends to the Cerro de Cotín (1.404), from which restrains a panoramic of Aragüés and the Sierra de Maito.
* ARAGÜÉS DEL PUERTO (970 m.) is in the contrary riverbank and it is the 'capital' of this valley. The population, has lived basically off the forest and cattleman exploitation that forced the men to pass long seasons far from the home. On the other hand, when the women have emigrated it has been ended up giving the circumstance of having more single men than single women
To the beauty of the place it unites the attractiveness of the fishing (trout), hunts (boar and sarrio) and that of the trips. They are many the Aragonese families and Catalan that here reside in the Summer. There is also in march a discreet hotel infrastructure: Lizara Hostel (rooms with bathroom, kitchens, dining rooms) in Lizara street, number 2. Tphn: 974 37 15 19.
The highway continues for the Valley of Lizara, following the course of the Osia river, during more than seven Kms. To their termination, a road continues until the vicinity of Corralones Spring (1.400 m.). From here, you can ascend to the Collado de Foratón (2.016) in less than 2 hours and from this, to reach the top of Visaurín (2.670) for the southern hillside (more affordable). It will be offered a beautiful panorama of summits: from the Anie and the Ory, until the solid of Monte Perdido, standing out in the proximities the Peñaforca, Agüerri, Alano, Chipeta, Castillo de Acher, Sierra Bernera and solid of Aspe. The image of the Pilar's Virgin in the same summit, testify the Aragonese of these Valleys.
There is another road that begins in the spring and climbs for Sierra Bernera skirts until the Collado de Ruabe de Bernera (2.140), to descend for the Valle de los Sarrios or Circo de Oliván (already in the Atlantic slope) until the Cantal de Estanés and Ibón de Estanés that is a fringe located to the North of Sierra Bernera and Sierra de Aísa and that belongs at the end of the Valle de Ansó.
A track communicates Aragüés with Urdués, in the Ravine of Santa Eulalia, (this population can be reached in from the highway of the Hecho valley) and from where a road that leads to the Ibón de Estanés and Paso de Aguatuertaaround the rock of Gabás and the Visaurín; it continues later, to the ravine of Agüerri to cross the port of Taxeras and to the other side, to go down to the birth of the Aragón-Subordán river (Ravine of the Wheel).
* Gathered of diverse sources for M. Tomé