[1] The ouvrage consists of three blocks facing Italy at an altitude of 1,870 metres (6,140 ft).

[2] Plan-Caval was located to control the Maglia and Cayros valleys, as well as providing flanking cover the La Béole and Saint-Véran.

An extensive set of underground barracks and magazines near the uncompleted entrances was never started, so that the ouvrage as constructed consists mostly of a single narrow gallery connecting the combat blocks.

[1] Plan Caval is also associated with a nearby casemate with one machine gun embrasure and one advance post bunker.

The Batterie du Plan Caval and its associated barracks are immediately to the west of the ouvrage.