Châlons-en-Champagne is a city in the Grand Est region of France. It is the capital of the department of Marne, despite being only a quarter t…Châlons-en-Champagne is a city in the Grand Est region of France. It is the capital of the department of Marne, despite being only a quarter the size of the city of Reims. Formerly called Châlons-sur-Marne, the city was officially renamed in 1995. It should not be confused with the Burgundian town of Chalon-sur-Saône.