1 Brittany region is the largest peninsula of France. 2  It is situated in the northwest of France, alongside the Atlantic Ocean and bounded to the east by the Pays de la Loire and Normandy regions.he Brittany coast accounts for number of grassy dunes and sandy beaches. This environment covers 20% of the coastline in the Finistere finistère department and35 % in The. Morbihan brittany also offers a contrasting coastal view with rugged and jagged cliffs and coloured and shaped. rocks