Valle de Ancares is a traditional region of Spain, in the province of León, which coincides with the municipal district of Candín and which in the second half of the 20th century gave its name to a larger territory known as the Los Ancares, the more relaxed and broader version of which includes other parts of the Bierzo in León, from Navia de Suarna to Piedrafita del Cebrero in the east of Lugoand part of Ibias southwest of Asturias.
It is a mountainous area, difficult to access until the end of the 20th century, which has maintained its own customs, architecture and language. It is located between two basins, that of the Sil River and that of the Navia River separated by the ports of Ancares Pass (1670 metres above sea level) to the north and Port of Portelo (1068 masl) to the south of the Ancares mountain range.
The spur of the Cantabrian mountain range known as the sierra de Ancares is a geomorphological system where the provinces of León and Lugo meet. It runs from south to north, from Peña Rubia in the south-western end, and separates it from the valley of the Balboa in León, and of the Noceda in Lugo, to the Ancares pass, which borders the Mingatón mountain range to the north and from where the Ancares valley opens up to the southeast, through which the river that has given its name to the whole region flows.
The Ancares valley, the result of glacial and fluvial erosion, is surrounded by mountains of high average altitude (Pico Cuiña 1987 masl) and steep slopes and is located in the northwest of El Bierzo. The main river is the río Ancares tributary of the río Cúa in the basin of the Sil River. It rises at the junction of the rivers Cuiña and de la Vega to the south of Candín. Its tributaries are the rivers Miravalles and Seco, and the streams of Penedón, Baliñas and de la Cruz. The valley closes at the southern end of the municipality of Candín, coinciding with the southern limit of the traditional district. Valle de Ancares. After this gorge, the valley opens out again in San Martín de Moreda and then the river flows into the Cúa in the municipal district of San Pedro de Olleros.
To the north of the Mingatón mountain range, towards Asturias, opens the valley of the río Ibias with the mountain ranges of Borde, Pandelo and Valcarce, and those of Muniellos, which separate it from the río Narcea and Barreiro, which separates it from the Navia.
To the south of the Barreiro mountain range extends the Navia basin with small mountain ranges such as those of Linares, Murias or Granda de Arrojo, until it reaches the district of Cebrero which forms the transition between Los Ancares and the Caurel mountain range.
Continuing from the port of Piedrafita to the east is the valley of the Valcarce tributary of the Burbia with the valleys of the Balboa on the left bank and Barjas to the right. To the north, the Burbia valley borders the Ancares valley, and further north opens up the Valle de FornelaThe traditional region of León, headwaters of the river Cúa. To the west of this valley are the traditional districts of Rivas del Sil and Laciana, which form the "Alto Sil".
The Leonese part of Los Ancares, in addition to the valley of the river Ancares, includes the valleys of Fornela, Burbia and Tejeira. The area covers an area of just over 62 000 ha. The Galician part is articulated around the villages of San Román de Cervantes and Navia de Suarna and covers an area of almost 8000 ha. It is drained by the tributary rivers on the right bank of the river Navia, whose sources are in the Ancares mountain range. The Asturian part comprises only the valley of the river Ibias or Pelliceira, about 1000 ha.