Caldes de Montbui (Catalan pronunciation: [ˈkaldəz ðə mumˈbuj]) is a town and municipality in the comarca[1] of the Vallès Oriental in Catalonia, Spain. It is situated in the upper valley of the Caldes river, and the highest point of the municipality is the peak of el Farell at 816 m. It lies about 30 km from Barcelona and it part of its metropolitan area.