Aalst is a city and municipality on the Dender River, 31 kilometres (19 mi) northwest from Brussels in the Flemish province of East Flanders. The municipality comprises the city of Aalst itself and the villages of Baardegem, Erembodegem, Gijzegem, Herdersem, Hofstade, Meldert, Moorsel and Nieuwerkerken; it is the tenth largest city by population with 90.068 inhabitants. Aalst is crossed by the Molenbeek-Ter Erpenbeek in Aalst and Hofstade. The current mayor of Aalst is Christoph D'Haese, from the New-Flemish Alliance party. The town has a long-standing (folkloric) feud with Dendermonde, which dates from the Middle Ages.

The Flemish Region, usually simply referred to as Flanders, is one of the three regions of Belgium—alongside the Walloon Region and the Brussels-Capital Region. Covering the northern portion of the country, the Flemish Region is primarily Dutch-speaking. With an area of 13,522 km2 (5,221 sq mi), it accounts for only 45% of Belgium's territory, but 57% of its population. It is one of the most densely populated regions of Europe with around 490/km2 (1,300/sq mi).