The Bidueiral de Gabín is a birch forest (bidueiros in Galician) belonging to the parish of Gabín, on the north side of the Sierra de San Mamede. It is considered to be the southernmost birch forest in Europe, as this species is more typically found in Nordic countries.

You can access the starting point, Campo do Casar, via a dirt track that can be driven on by mountain vehicles; it is therefore recommended that you use the off-road taxi service available from the town of Montederramo. The access and the entire route follows forest tracks with gentle slopes, so they can easily be traversed on foot or by bicycle.

Birches in Spain rarely form a forest, although they are frequently found in the northern mountain ranges where, as in Montederramo, they are interspersed with holly, rowan, heather and berry trees. Along the route, we will also cross other areas of wild pine forest.