It is located to the southeast of Álava and covers an area of 534.87 km² with a population of 3179 people (2010).
The capital lies in Santa Cruz de Campezo.
It includes the municipalities of Arraya-Maestu, Bernedo, Campezo, Lagrán, Peñacerrada and Valle de Arana as well as the lands of the Parzonería de Encía and the communities of Laño, Pipaón and Peñacerrada.
Montaña Alavesa is a mountainous region and sparsely populated.
Thanks to rising tourism the services industry is presenting an important area of development.