sentences:  At the bottom of granite valleys and on the siliceous riverbanks, there are very typical formations of ash with Pyrenean oak, especially at the foot of thin interior mountain ranges.The sheltered gorges of the Serranía de Cuenca have mixed riparian forests of lime and hazel trees, with ashes, willows and Wych elm ("Ulmus glabra").Because these woods occupied some of the most fertile lands, where people have planted orchards since ancient times, they have not been well preserved.