Aarau is a town, a municipality, and the capital of the northern Swiss canton of Aargau. The town is also the capital of the district of Aarau. It is German-speaking and predominantly Protestant. Aara

Busbetrieb Aarau AG is a public transport operator serving the city of Aarau, Switzerland and the surrounding areas in the Canton of Aargau. It was founded in 1958 and operates using the BBA Bus Aarau