Cerdanyola del Vallès is a municipality in the comarca of the Vallès Occidental in Catalonia. It is situated on the north side of the Collserola ridge. The town is served by the A-7 and C-58 motorways, the N-150 road and the Renfe railway commuter lines R4, R7 and railway regional line Ca4. It is well known as the site of the main campus of the Universitat Autònoma de Barcelona and hosts the ALBA (synchrotron) located in the Barcelona Synchrotron Park.