This municipality covers the towns of Castejón de Sos, Liri, Ramastué and El Run and it is located at 900 metres high. Its climate is not really extreme in winter since it remains protected from the northern winds, and in summer the temperature is soft and pleasant.

Castejón de Sos is culturally restless and locals organize different events during all year long, such as the Jazz Festival, the international harp courses, concerts, debates, exhibitions and performances overall. Rich in history, this town has a small chapel devoted to Nuestra Señora de la Plana dating back to the 17th century and an old town area with enormous stately houses of noble doors and stone façades, and the remains of the former 17th century church which has been restored and nowadays has become a cultural centre.

However, what makes Castejón de Sos so brilliant it is the fact of being the best flight area in the old, whether for paragliding, hang glider or ultralight practice with a self aerodrome. Also stand out the wide offer of routes and descents that the MTB Company Puro Pirineo has created in this municipality and its attractive paths proposals for hiking.

Interesting sites in Castejón de Sos and its surroundings

 Pyrenean mountain goat (sarrio) museum

 Congosto del Ventamillo

 Liri waterfall

The Pyrenean mountain goat is an endangered species that coexisted during years with the intensive stock activity and nowadays is fighting for its survival. For this reason, the Castejón de Sos council opened the museum devoted to this species, in order to explain and analyse the behaviour of this emblematic Pyrenean mammal from which lot of things can be learned.

Congosto de Ventamillo is an impressive opened gorge in Ésera River. Thousands of years ago, this place was covered by the Ésera glacier which reached 36 km long and 800 metres thick.

This gorgeous place can be crossed from the beginning to the end through the road that access Benasque Valley and there are also several paths for enjoying this nature gift.

The Liri cliff is located in the homonym town, Liri. This cliff is formed by a succession of almost 12 waterfalls and other water sources in which canyoning can be practiced.

Approximately at half route, there is a path that allows getting inside the cliff in order to contemplate the spectacular waterfalls that never leave this place in silence.