The geographical area covers 1,409 communes and lies entirely on the Armorican Massif, with zones dominated by deep silts and others by shallower formations over sandstone and granite.
The climate is oceanic, with mild temperatures and regular but not excessive rainfall; seasonal variations in temperature and relative humidity are slight, owing in particular to the influence of the Gulf Stream.
Brittany holds, within faults of its predominantly granitic bedrock, groundwater reserves of low turbidity, weakly acidic to neutral pH, low in calcium and magnesium, and of low to moderate conductivity.
Facts drawn from the specification's terroir-link section by automatic interpretation — see the source.
About this boundary · approximate area
Approximate area — the union of the 1202 commune(s) of the delimited area (INAO); no parcel delimitation exists for this denomination.
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