 The administrative region was formed in 1956, consisting of the four departments Aube, Ardennes, Haute-Marne, and Marne.On 1 January 2016, it merged with the neighboring regions of Alsace and Lorraine to form the new region Grand Est, thereby ceasing to exist as an independent entity.Its rivers, most of which flow west, include the Seine, the Marne, and the Aisne.