In Lombardy, between Lario, Val d'Esino, and Valsassina, a few steps from the western summits of Orobie, the Park covers a territory of over 5,000 hectares around Grigne massif, one of the most famous mountain groups of the region, formed by the Southern Grigna, or "Grignetta", and Northern Grigna, or "Grignone". The wonderful calcareous rock with its particular formations forms the setting of a world that has remained unchanged over the centuries, the result of a balanced combination between natural resources and human presence, forests and pastures, imposing mountains and malghe, mountain huts, trails for hiking and trails for mountaineering.