Basauri is a major municipality of Biscay, in the Basque Country, an Autonomous Community in northern Spain. The town is a part of the …Basauri is a major municipality of Biscay, in the Basque Country, an Autonomous Community in northern Spain. The town is a part of the Greater Bilbao conurbation, being only a few kilometers south of Bilbao. It is an industrial town with monuments such as the tower house of Ariz. It is home to the province's only prison, located where the Nervión and Ibaizabal rivers meet. The municipality had a population of 40,589 in 2019.