Aa is a village in Assens Municipality, in the region of Southern Denmark, Denmark. Aa lies at 3 m above sea level. The nearest city is Haderslev, 31 km to the west. Beaches nearby: Helnæs (10 km), Assens Næs (8.4 km), Sandager Næs (15 km). Among the landmarks around are Nonnebakken (33 km), Lusehøj (5.2 km) and Egeskov Castle (33 km). Among the natural features are Frøbjerg Bavnehøj (16.3 km) and Øksnebjerg (6.0 km).