Assen's main claim to fame is the motorcycling circuit, where the TT race is annually run.
The municipality of Assen has an area of 89.00 km² (0.65 km² water), and includes the following towns: Anreep, De Haar, Graswijk, Loon, Rhee, Schieven, Ter Aard, Ubbena, Vries, Witten, Zeijen, Zeijerveen, Zeijerveld.