Épernay is a commune in the Marne department of northern France, 130 km north-east of Paris on the mainline railway to Strasbourg. The town sits on the left bank of the Marne at the extremity of the Cubry valley which crosses it.

The Marne is a river in France, an eastern tributary of the Seine in the area east and southeast of Paris. It is 514 kilometres (319 mi) long. The river gave its name to the departments of Haute-Marne, Marne, Seine-et-Marne, and Val-de-Marne.