The average altitude is 838 meters. Is from the Douro river to the north and the river Paiva, to the south, bordering the city of Lamego. The highest point of the mountain is called by Talegre or Talefe, the 1381 meters of altitude. The whole mountain is quite steep terrain and is virtually everywhere. The saw is populated up to about 1100 meters of altitude, the villages are scattered throughout the mountains, but often near water courses, as Bestança river that divides the South-North direction.

The Serra de Montemuro, is the 1st phase of the national list of network sites natura 2000. It is classified as CORINE biotope, with designation of Serra do Montemuro / Bigorne.

In the thirteenth century was cited in inquiries of 1258. The archaeological site is shared by two neighboring municipalities: Castro Daire and Cinfães. According to some authors, the site attests scarce traces of a fortified settlement from the Iron Age, which can be considered as part of the Celtic culture. The “castro” will then been reused by the Romans and during the Reconquista, by D. Afonso Henriques (note that some surrounding land have belonged to Egas Moniz).

The term doors have appeared officially for the first time in the charter of Bustelo village, granted in the thirteenth century and is also known as the Western Wall Doors or simply Wall, by hunters and shepherds passing through the site and will relate, perhaps the passage of transhumant herds of Serra da Estrela. There is a chapel near the site, a typical attitude of adopting the Christian religion of sacred sites or supposedly sacred pagan era.