Other contributors have said "What are the provinces western canada?" is the same question as "What are the provinces of Western Canada?" If you believe that these are not asking the same thing and should be answered differently, click here
British Columbia. And also North of B-C there is the Yukon, but it is not a province. It is a territory.British Columbia is Canada's western most province.
Yukon Territory is the westernmost section of Canada, but it's not considered a province since it's only a territory. So the westernmost province would be British Columbia.
The two phrases "western Canada" and "Western Canada" are not entirely interchangeable. Depending on the context, either one of them or both of them may be correct. If you are referring to Canada's...