Azy-sur-Marne is located 4 km southwest of Château-Thierry and 20 km east of Montreuil-aux-Lions. It can be accessed by the D969 road from Essômes-sur-Marne in the north through the village then west through the commune and continuing south to Romeny-sur-Marne. There is also a country road going west to Mont de Bonneil. The commune is almost entirely farmland with small forests in the north and west. The commune is within the Appellation d'origine contrôlée zone of Aisne Champagne.[3]
The southern border of the commune consists of the Marne river with no other identifiable watercourses in the commune.[3]
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