The hydrogeological and hydrochemical features related to the geological-structural setting were studied in two important karst hydrogeological units of the Central Apennine belt. The studied areas are strategically important groundwater springs that discharge (up to 9 m 3 /s), and are relevant for the interactions between the stratigraphic-structural setting and groundwater circulation. In this paper, the importance of identifying these so-called``natural hydrogeological laboratories'' is highlighted; whereas these conditions may be applied to speci®c areas or hydrostructures, both new investigating techniques might be tested and constrained mathematical models might be examined.
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