The calculated distance (air line) between La Roca del Vallès and Arenys de Munt is approximately 11 miles respectively 18 kilometers.
By car or train, the actual journey to Arenys de Munt is certainly longer, as only the direct route (as the crow flies) between La Roca del Vallès and Arenys de Munt has been calculated here.
Air line (approximately)
18 kilometers
9 nautical miles