Armorican Massif
The rock stands proud proof that the Basse-Normandie region is Armorican, at least in its western half. The Armorican Massif does not stop at the border with Brittany, the neighbouring region, but extends to the départment of Manche, south-west of Calvados and west of Orne. Norman Switzerland is at the eastern end of the Armorican Massif, with the Rock at its centre.