The Aarhus River is a 40 km long stream that drains a basin of 324 km² in the middle eastern part of the Jutland peninsula. The river originates 54 m above sea level in Astrup Mose (bog) next to Stilling-Solbjerg Sø (lake) southwest of Aarhus (56°6' northern latitude, 10°9' eastern longitude) and exits into Aarhus Harbour at 56°9' northern latitude, 10°13' eastern longitude.