Marne is a department in the Grand Est region of France. It is named after the river Marne which flows through it. The prefecture of Marne is Châlons-en-Champagne. The subprefectures are Épernay, Reims, and Vitry-le-François.
The Champagne vineyards producing the world-famous sparkling wine are located within Marne.
Wikipedia https://en.wikipedia.org/wiki/Marne_(department)
Coordinates 48°57'23.838" N 4°21'46.386" E