The production centre of  Pizarras Forna, S.A. is in the region of La Cabrera.

La Cabrera is a mountainous region in the South-West of the province of Leon (Spain). It covers an extension of 900 square kilometers and includes the municipalities of  Benuza, Encinedo, Castrillo de Cabrera (Cabrera Baja) and Truchas (Cabrera Alta) with a total popultion of 3,000 inhabitants.

Its boundaries are the Aquilianos Mountains and the El Teleno Mountain Range, to the north, and the La Cabrera Mountain Range, to the south.

Both the quarry and the factory are to be found in the town of Forna, in the municipality of Encinedo (Leon-Spain), at an altitud of 1,400 metres.

The geographical boundaries of La Cabrera coincide in part with the boundaries of a geological structure known as “Sinclinorio de Truchas” ("Syncline of Truchas"), in the central area of which the stratum of slate exploited by Pizarras Forna, S.A. is to be found. The slate in this deposit was formed in the Paleozoic geological period, 500 million years ago.