Un océano de paz en el Sistema Ibérico

Mosomero valley

Slope: Sierra de Algairén

Distance: 5 - 6 Km 

Time: 4 - 5 h.        

               Mosomero Valley is place paralely to Grío Valley, being the last valley in the Iberian range of the area, facing the flat area of the Ebro valley, the so called "Campo de Cariñena". In  its final slopes several villages are placed, reachable on trekking across Mosomero Valley. There's Alpartir placed upon teh river Tiernas, often waterless, Almonacid (on the other side of the mountains, following the old trail used by woodcutters and wood coalmen) or Cosuenda, also on the other side, up the valley.

            It's an isolated valley where no villages are to be found, there's only an unasphalted track for cars and a cottage with no present use. All area is covered with forest of several types of trees like oaks, holm oaks, cork oaks, pines, ...

            A big problem of the valley is its scarce water. River Tiernas is often dry and thre's a fountain, Fuente de la T. To go there it's advisable to carry water and in summer to think about coming back not later than 11.00 AM.

            Its second problem is the lack of appropriate signaling of its trails. The valley is not visited often, except for hunters and mushroom pickers in the autumn season.

            The way can be followed on foot, mountain bike or jeep to a certain point at the top of teh mountain, then walking is preferable. Remmeber that the whole route takes 4 or 5 hours, so in summer don't start this trlkking much later than 7.00 AM to make sure you're back home before you're exhausted and thirsty

            After these considerations, if you still feel adventurous, you can start your route to the once so called "Love Valley" by the members of a comune stablished in some huts of the valley.


            For orientation, follow the following signs. These indicate the trails communicationg the villages of Tobed, Alpartir, Almonacid and Cosuenda.

Sign indicating PR (Pequeño Recorrido) trail.

             Start it by leaving the house and going down Barranco de Valdeolivo Rd, cross the main road towards the river and immediately turn left. When you see the house of the photo take the street on the left. If the river flows you can also take the road on the right, go across the bridge and once passed turn left.

Road fork. Take left towards the river and a track beside the river downstream.

        Once passed the river, follow the track to the following fork, and follow straight till you find a track wide enough for cars. It's called Camino Viejo, which was the main road 100 years ago till the construction of a modern asphalted road on the other slope of the valley.

Track fork to Barranco de Valvillano (right) and Camino Viejo (left, among the trees).

            The remains of the buildings on the right of that track used to be wharehouses for wheat and straw next to the threshing floors.

             Along the track you'll see different fields with several fruit trees. After about 1 km you'll find the monument to Virgen del Carmen.

Virgen del Carmen on the right of Camino Viejo.

              Some time ahead you'll leave the Camino Viejo, turning right, to go up a track which runs upstream Barranco de Valtrobá towards the top of the mountains, where you'll find numerous holm oaks and then pines.

Exit of the main road towards Mosomero through Barranco de Valtrobá (right)

           Trekking up the track for about 1 km, when you see the rock of the picture on your right, you'll already be near the summit.

           Following several bends you'll finally have an enormous view of Valle de Mosomero. If you've driven till there, it's time to park. From then on, you have to trekk or bike riding downhill along a narrow path, following the Yellow-White signs.

Beginning of the trekking path to Mosomero from the top of the mountain.

View of Mosomero Valley from sierra de Algairén. At the far end the Ebro valley.

Walking down towards the centre of the valley in the pine forest area. See sign.

 Trail next to the old hut next to the ravine.

             When you reach the hut in the photo you have to decide where you want to head on for the rest of your route:

            When you finally reach near the ravine Tiernas (usually without water) you can walk downstream to the village Alpartir, near La Almunia de Doña Godina. There's another easy option, driving to Alpartir through regular roads and then walk upstream to this point. When you have to come back, just use the narrow track downstream to you car again and drive home. Easier but less adventurous. 

            Without going to the other bank of the river, you can go to Fountain La Teja, just crossing the little ravine on your left, going up for a little time towards some big pines and you'll find it (very little urbanised, though).


Fuente de La Teja. Little water, but you appreciate it after an exhausting trekking.

            If you cross the river and walk upstream on your right you'll find a wide track and soon a small trail uphill which after a while finally ends up in Almonacid, on the other slope of the mountain. You'll walk past several remains of old wood coal humps, as in the area in the old times people used to cut wood for fire or to make wood coal on sale in the villages of the plain.

Trail uphill to Almonacid (left), track upstream along the valley (straight on).

            If you prefer to walk upstream on the wide track, you'll soon find a cottage. It's private property but with very little use. Without leaving the track you can go up the valley until the begining or even jump to the other slope to arrive in Cosuenda.

Cottage in the centre of the valley, usually non unhabited.

Fuente Jordana, soon after the cottage. easy to reach, with a picnic area but usually without water.

            Ifyou walk up the hill you'll find the oak forest, and then, after reaching the summit, you can still go further till Cosuenda or trekking up to Pico Valdemadera (1270 m over sea level), distinguisible with its aerials for telephone and TV.

         Along the route you'll find interesting botanic species, like the following.


Examples of the valley flora: oak, lichen and ruscus.

                     To come back to Tobed, it's important to find the point where you have to leave the wide track, cross the stream and then come back to the hut mentioned before. Then you can visit Fuente de la Teja, have a rest and drink some water as the trekking uphill can be exhausting. (500 m. gradient).

Coming back to Tobed, leaving the main track for Tobed (left)

Way back to Tobed. The old hut is a good point of reference. The trail goes up next on its right.

            When you have gone past the mountain top you can have a whole panoramic view of Grío valley, its mountains, forest areas, fields and the villages nearby.

            Trail fork towards Tobed, descending from Mosomero Valley. On the left it's a shorter way but not well defined so better avoid it. On the right, way back to Tobed through the same route you took on your way to this valley route.

            Let's hope that with these instructions you have enjoyed a nice day breathing pure mountain air. Now it's relax time.

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