Modern day Brittany (Breton: Breizh, Gallo: Bertaeyn, French: Bretagne) is considered a historical region, which includes the Loire-Atlantique department.
Brittany's strongest international connections tend to be in the United Kingdom, particularly in the Celtic Brythonic groups of Cornwall and Wales, and in Canada.
The region of Brittany used to be divided by an imaginary line into two subdivisions based on linguistic boundaries between Gallo and Breton.
However, both languages have been on the decline in the region since the French Revolution, as the people who kept speaking them were seen as "counterrevolutionary" and the regional languages and dialects were heavily discouraged by the Government of France.
French Wikipedia links This Brittany-related article is a stub.