Heavy industry used to be concentrated in the Naples metropolitan area, in which the largest industrial area was Bagnoli, a suburb located North of the city. Bagnoli enjoyed a favourable logistic position due its proximity to the sea and to an industrial harbour, and included Steel factories that were among the largest in Europe. The steel factories operated since 1905 for about 80 years, but by the end of the sixties, all industries of Bagnoli area gradually started to lose competitiveness, and the steel factories were definitively closed in 1991. At the beginning of the 70s, plans for the de-industrialization of the area were presented, as it was perceived that the causes of competitiveness loss were impossible to remove. In 1970 the City Council decided that 30% of space of the industrial should be dismantled and turned into public parks. In 1976, a definitive report concluded that the lack of competitiveness was due to impossibility to expand the facilities because of lack of space. The metropolitan area of Naples is limited by two dangerous areas, the Mount Vesuvius on the South, and supervolcano Campi Flegrei on the North, leaving little space in proximity of the sea.