Mareuil-sur-Ay is a former commune in the Marne department in north-eastern France. Since January 2016, Mareuil-sur-Aÿ is part of the administrative commune Aÿ-Champagne. Its population was 1,113 in 2019.The patron saint is Saint Trésain.
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Coordinates 49°2'45.619" N 4°2'19.436" E
