The Functional Area of Donostialdea-Bajo Bidasoa takes shape as one of the regions suffering a higher urban development pressure during the last years in the Basque Country. The growth of the artificialized area exceeds a 12% fron 2004 to 2008. Facing this high rate of artificialization, it is becoming obvious the shortage of this resource and the need to sort it out and arrange it properly so that other uses (agricultural, natural)... may coexist with those merely of the urban development or related to the industrial area or to the service sector. Up to now, the orographic factor has been the main determining factor when placing the urban-industrial settlements in the area, which have occuppied mainly the coastal corridor and the bottom of...