Avant-lès-Ramerupt is located some 30 km north-east of Troyes and 15 km south-east of Arcis-sur-Aube. Access to the commune is by the D5 from Creney-près-Troyes in the south-west which passes through the village and continues north-east to join the D441 near Coclois. The D99 passes through the north-west of the commune as it goes from Charmont-sous-Barbuise to Ramerupt. The D107 links the D99 to the village through Mesnil-Lettre. The D48 comes from Nogent-sur-Aube in the north-east to the village then continues south to Longsols. The commune is U-shaped oriented north-east with the village in the eastern arm of the U. The commune is entirely farmland.[3]
The Arcot rises just north of the village and flows south-east to join the Longsols just south of the commune.[3]
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The commune has one religious building that is registered as an historical monument:
The Church of Saint Denis (12th century).[7] From the east its Apse and its Choir are early Gothic, the Transept, the Nave, and the lateral naves were built in the 16th century. The tower dates from about 1200. The lateral naves are covered with a Gabled roof. The building was constructed by the chapter of Pougy.
The Church contains many items that are registered as historical objects: