The Aa is a small river in the Netherlands. It rises near Nederweert in the southeastern province of Limburg, in the Peel region. It flows northwest through the province of North Brabant towards 's-Hertogenbosch, roughly along the Zuid-Willemsvaart canal. In 's-Hertogenbosch, at the confluence of the Aa and the Dommel, the river Dieze is formed, which flows into the Meuse a few km further. The main cities and towns along the Aa's course are Asten, Helmond, Veghel and 's-Hertogenbosch.

's-Hertogenbosch, French: Bois-le-Duc, ; German: Herzogenbusch, colloquially known as Den Bosch, is a city and municipality in the Netherlands with a population of 157,486. It is the capital of the province of North Brabant and its fourth largest city by population. The city is south of the Maas river and near the Waal.