The commune is located at the foot of the foothills of the
Armorican Massif on the
Odon river a few kilometres east from its source. It is at the heart of the
Pre-Bocage country of transition between the Caen plain, the
Bessin, and the
Bocage virois with which it is also connected. Located at the intersection of several county roads, the agglomeration is south of
Villers-Bocage, south-west of
Caen, and north-east of
Vire. The D8 goes north-east to
Bauquay and Caen. The D6 connects Aunay to Villers-Bocage in the north and
Thury-Harcourt to the south-east. The D54 joins
Cahagnes and
Caumont-l'Éventé in the north-west through the village to
Roucamps,
Le Plessis-Grimoult, and
Condé-sur-Noireau in the south. The D26 goes to
Vire via
Danvou-la-Ferrière and
Estry in the south-west. The D213 goes to
Courvaudon in the east with the D234 branching to serve
Bonnemaison. The D214 goes north to
Longvillers. The D291A goes west to
La Bigne. Aunay-sur-Odon is in the
drainage basin of the
Orne by its tributary the
Odon which crosses the commune from west to north and which has its source in the neighbouring commune of
Ondefontaine. Several small tributaries feed it such as the
Douvette which marks the boundary with
Courvaudon in the east and the
Ruisseau du Val Boquet on the north-west border. The highest point of is located in the south on the border with
Roucamps in a wood overlooking a place called
Pied de la Bruyère. The lowest point is at corresponding to the exit of the Odon from the commune to the north. The commune is about one eighth urban, forested throughout the southern part, and
Bocage on the rest. As in all of western France, Aunay-sur-Odon has an
oceanic climate. The nearest weather station is at Caen-Carpiquet north-west. Pré-Bocage country however differs in the annual rainfall which in Aunay-sur-Odon is around 950 mm. ==Toponymy==