When spelled with the letter "a" the champagne is all produced within the Champagne appellation.
Cramant is a town located in the department of Marne of the french region Champagne-Ardenne. The town of Cramant is located in the township of Avize which is part of the district of Épernay.
When spelled with letter "e" Crémant is a term used to describe all the methode Champenoise produced outside of the Champagne appellation.