Nowadays, urban dynamics in most Western countries are characterized by a change in which the leading role has moved away from big compact cities to their peripheries. This process has favoured the sprouting of a diffuse city that consumes many resources and generates multitude of problems. Seville and Granada, in the Andalusian case, perfectly illustrate this quite generalized process. Urban and spatial planning try, with limited success, to restrain this tendency fed by economic interests that often are beyond control.