French Canadian consists of quite a few components, and several languages fall under this term. Quebecois (Quebec French), Acadian French, Metis French and Newfoundland French are all part of the general category of French Canadian. Furthermore, French Canadians often refer to a people too, and not just a language. These French Canadians sometimes tend to also speak Canadian English, which is similar to British English, or American English.
The province of Quebec is the heart of French Canada, and about six million of its residents speak native French, and only about one million of them are English speaking. Throughout the rest of Canada, you will only find about one million French speaking Canadians. Therefore, the language is clearly quite concentrated!