Cangas del Narcea is the oldest municipality in the Principality of Asturias in Spain.

Cangas del Narcea is also the name of the municipality's capital, and one of the judicial districts in Asturias.

Cangas del Narcea is divided into 54 parishes: Muniellos Wood, a nature reserve which lies within Cangas del Narcea and Ibias, is the core area of the Muniellos Biosphere Reserve (designated by UNESCO in 2000 and later extended).

The natural park provides the core area of the biosphere reserve with a buffer zone.

[2] The park's formation prompted legal action by landowners, but a management plan for the protected area was approved in 2006.