Aulnay is located on the Via Turonensis. one of the Ways of St. James some 45 km east by south-east of Surgères and 17 km north-east of Saint-Jean-d'Angély. Access to the commune is by the D950 from Les Églises-d'Argenteuil in the south-west which passes through the commune just west of the town and continues to La Villedieu in the north. Apart from the urban area of the town the commune is entirely farmland.
The commune has a number of buildings and structures that are registered as historical monuments:
- The Minargent Distillery (1910).
- A Chateau (13th century).
- A Dairy Factory (1926).
