WArribes are the banks of the rivers in the southeast of the province of Zamora and the northeast of the province of Salamanca, Castile and León, Spain.
WArribes del Duero Natural Park is a protected area in western Spain, covering 106.105 ha in the autonomous community of Castile and León. In this area the river Duero forms the national boundary between Spain and Portugal, and the Portuguese side is also protected under the International Douro Natural Park. The most notable characteristics of this natural space are its biodiversity and range of watercourses, which have eroded deep valleys and vertiginous precipices. This landscape is known as Arribes, which is where the reserve name comes from.
WThe Circo de Gredos is a glacial cirque in the central part of the north slope of the Sierra de Gredos. It is one of the most important areas in the Parque Regional de la Sierra de Gredos.
WHoces del Rio Duratón Natural Park is a natural park of 5,037 hectares 1,2 km West from Sepúlveda, Segovia. Its name refers to the Duratón River. "Las Hoces" refers to the series of 100m high gorges that were formed by the Duratón.
WOjo Guareña is a karst complex located in the Cantabrian Mountains of Castile and Leon, Spain, declared a natural monument by the government of Castile and Leon in 1996. It is composed of over 90 kilometres (56 mi) of galleries and passages within an area of some 13,850 hectares. The limestone formation containing the system is approximately 100 metres (330 ft) thick and sits on a massive water-resistant layer of marl. The caves were formed in the limestone by erosion sometime within the Coniacian Age. Ojo Guareña was considered the greatest karst system of the Iberian Peninsula until 2009, when a significant length of new passages was discovered in the Mortillano system.
WThe Puerto del Escudo is a mountain pass at 1,011 meters elevation located in the valley of Luena, to the east of the Sierra del Escudo mountain range and on the boundary between Cantabria and Castile in Spain. The source of the Magdalena or Luena River is located there. It has been one of the main access routes from the coast to the interior plateau crossing the Cantabrian Mountains. At the moment the N-623 highway runs over it and is well known for its steep inclines on its Cantabrian slope that can be up to 15%, causing a difficult transit for heavy vehicles. This characteristic and its altitude result in the relatively frequent closing of the pass when there is heavy snow in the winter.
WThe Rudrón Valley is a valley of the province of Burgos, in the autonomous community of Castilla y León, Spain, that borders the autonomous community of Cantabria.