That part of it of which I shall here speak, the part right up against the frontier ridge, is included between the big lump of mountains which surrounds Panticosa (of which the Vignemale is the most conspicuous) and the other big lump of peaks which is called the Maladetta group.
It has three towns corresponding to its three valleys, Torla in the Broto upon the Ara, Bielsa upon the Cinca, Venasque upon the Esera.
The Cinca, however, receives, right up at its sources, an affluent longer and more important than itself, called the Cinqueta, and on this stream is a group of villages, none of them important enough to be called a town, but standing so close together as to make a considerable centre of habitation.
But for these towns, the group of villages I have mentioned and one or two tiny hamlets, these Spanish valleys are wholly deserted, and they form by far the most rugged and difficult district of all the Pyrenees.
They also hold the highest peaks of the mountains; the culminating Nethou Peak of the Maladetta group, just upon the eastern edge of the district (11,168 feet); the Posets (11,047), the Mont Perdu (10,994), the Pic d’Enfer (10,109), the Vignemale (10,820) all stand here. Most of the high peaks are in Spain, but it is another feature of the district that the frontier ridge is higher here than in any other part, and is also more continuous. The summit of the Vignemale forms part of it, and the notches by which it may be traversed in these 40 to 50 miles lie but very little below the surrounding peaks. Only 3 of the passes miss the 8000 foot line. The Port du Venasque, at the extreme eastern end opposite the Maladetta, is 7930 feet in height; the Port de Gavarnie at the extreme western end is 7481. These two form the chief thoroughfares over this high and difficult bit; that of Gavarnie, upon the French side, is being prepared for wheeled traffic. The third, the Port de Pinède, also misses the 8000 foot line, but only misses it by 25 feet. All the other passes are but slight depressions in this barrier of cliff. The Tillon or rather the passage to the side of it, is little under 10,000 feet, the Pla Laube is over 8000, so is the Marcadou, so is the better known and more used pass of Bielsa, while the Port d’Oo is 9846, and the Portillon d’O is 9987.
The impression conveyed by this long line, the only line in the Pyrenees where even small glaciers may be found, is of an impassable sheer height, just notched enough at one point on the west to admit a painful scramble into the valley of the Gave d’Pau and on the east to admit one into the Valley of the Lys (into the basin of the Adour, that is) at one end, and into the basin of Garonne at the other.
A journey through Sobrarbe can be undertaken either from Sallent and Panticosa or from Gavarnie, and in either case your exploration of high Sobrarbe begins at the hamlet of Bujaruelo, which the French call Boucharo.
How to reach Bujaruelo from Gavarnie I shall describe later: for the moment I propose a start on the Spanish side.
If you start from the Spanish side at Panticosa, a plain path takes you up the valley of the Caldares until you are right under the frontier ridge. There the path bifurcates; you take the right-hand branch along the chain of lakes that lies just under the wall of the main ridge, and you climb slowly up to the path at the head of it. The whole climb from Panticosa to this pass is 3040 feet, and it will take you from early morning until noon. Or, if you will start before a summer dawn, at any rate until the heat of the morning. For though it looks so short a distance on the map, and though there is no difficult passage, it is very hard going. The reason I mention this matter of hours is that when you have got down the other side into the valley of the Ara, you are still 8 miles by the mule path from Bujaruelo, and though it is all downhill, you will hardly do these 8 miles under two hours and a half; however early you start, therefore, the back of the day is likely to be broken by the time you come to Bujaruelo. Once there a new difficulty arises; for Bujaruelo is not a pleasant place to sleep in. I have not myself slept there, but the verdict is universal. Though you are coming from a Spanish town the Customs may bother you at this hamlet because they cannot tell but that you have come over some one of the high passages from France, such as the Pla Laube up the valley. At any rate, unless you are going to camp out you must push on to Torla, 5 miles on down the valley, and you will pass through a great gorge on your way. Now at Torla the hospitality, though large and vague, is good enough.
If, however, you are taking the Upper Sobrarbe with the idea of camping, you must not go on to Torla, but you must do as follows. Just at the far end of the gorge of which I have spoken the path crosses the river Ara by a bridge called the Bridge of the Men of Navarre. There you will see a path leaving yours to the left, and zigzagging up the mountain side eastward. This is the one you must take. It climbs 600 feet, gets you round the cascade which here pours into the Ara from a lateral valley, and finally puts you on to the level floor of that lateral valley: it is called the valley of Arazas. Here there is excellent camping ground everywhere, and it will be high time to look for a camp by the time you are well upon the floor of that gorge; you may have to go up some little way to find wood, but much of this valley in its higher part is clothed with forests. The next day you must, as best you can, force your way to Bielsa, and unless the weather is fine you may very possibly have to sleep another night upon the mountain.