Pas and Miera valleys,Spain

The Valleys of the Pas and Miera Rivers comprise an administrative comarca in Cantabria, Spain. It is formed by the valleys of said rivers, each one being a natural comarca of its own.The Pas-Pisueña valley is located in the autonomous community of Cantabria, and through it flow the Pas River and its main tributary, the Pisueña River, which joins the Pas in the township of Vargas, part of the municipality of Puente Viesgo.

In the whole valley, the repopulation allowed by the foundation of several monasteries had great importance. The most important were the San Vicente de Fístoles monastery and the Santa Cruz de Castañeda collegiate church. In addition to the monasteries, several romanesque temples were built during the 11th to 13th centuries, some of which still stand: the aforementioned Santa Cruz de Castañeda church, the Santa María de Cayón church, and the temple of San Miguel de Monte Carceña, among others. These buildings show the peak and the importance that this comarca had during those centuries.

The Miera valley its a natural valley located in the autonomous community of Cantabria, travelled by the Miera River. It is in itself a natural comarca, and the narrowest of the Cantabrian valleys. Its slopes are most noticeable and its peaks very high (Castro Valnera at 1,707 m over sea level).The valley occupies partially or totally the municipalities of Soba, San Roque de Riomiera, Miera, Liérganes, Riotuerto, Medio Cudeyo and Ruesga (Calseca enclave).In its morphology are remarkable the sandstones and limestones, and the vast deposits of debris originated by ancient moraines from glaciers in its highest part. It also features large karstic areas. Nevertheless, some of its glacial valley characteristics have been modified in some points by the torrential nature of the Miera River near its source.The higher basin of the Miera has an abrupt relief, not suitable for the human habitat. In spite of that, caves with prehistoric settlements have been discovered in Piélagos, Rascaño and Salitre, one of the highest altitude (450 m over sea level) stations with paleolithic art.The medium valley of the Miera River, that mostly coincides with the municipality of Miera, is trapped between the abrupt karstic limestone pavements of Porracolina to the East, and Las Enguizas to the West, both belonging to the Urgonian Complex.

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