Geoparks, like all parks, are UNESCO awards for a sustainable management of all resources and therefore also of human life. Environmental emergencies such as climate change, pollution, soil erosion, salinisation, and fires that, together with health emergencies, undermine life on earth, require intervention. The widespread sustainable management of the territory of a municipality, a region, a nation, or all of them (European Union) allows to widen the application of these concepts to reach the limit of a planet that guarantees life for future generations. The work after having exposed the motivations of the geopark (an initiative born by chance), i.e. the surface where the environmental beauties such as the Canyon of the Corleone River, the Waterfall of the Two Fortresses, the vertical walls with many layers from green (glauconite) to greenish yellow, two huge blocks of limestone called Castles (distinct in Soprano and Sottano) together with tabular structures give rise to a unique landscape that characterizes the city of Corleone and its adjacent territory. The application of the principles of the Land Cadastre of the extra-urban Soil to two plots has made it possible to highlight the ease with which sustainability can be assessed and also the need to intervene in one plot, giving indications of grazing management to limit or stop the erosion in progress. The water resources of Corleone come from this formation, but also the cheeses that together with durum wheat, oil and wine from other territories create a rich area that has allowed the population in past centuries to pay tyrants to regain their freedom. Today, by networking the structures for the reception of visitors, it is possible to create development and enhance the local production. This is why Corleone can be defined as the City of bread, wine, oil, water and breathtaking views and sunsets, the “The city of clean living”.