The territory of Normandy offers biodiversity that participates in its identity and is an important asset for its economic and social development.In fact, the preservation of biodiversity represents an asset in the attractiveness of the territories by maintaining a quality living environment for the inhabitants and by the development of economic activities linked in particular to the tourist attraction of the region.The hillsides and limestone lawns are among the most emblematic natural environments in the region.Reknown for their great ecological interest, they welcome remarkable, often rare and threatened fauna and flora unique in the region. In order to preserve the natural heritage, the ecological functions and the landscapes that make hillsides and limestone lawns typical, the Conservatoires d’espaces naturelles de Normandie wanted to mobilise all the actors in these areas around a regional programme of joint actions: the Regional Programme of Action for Limestone Hills and Lawns.The particular interest of limestone habitats in hosting remarkable biodiversity is highlighted in the Regional Ecological Coherence Schemes (SRCE) of the two territories. For the former high-Norman territory, a neutro-calciculture subtrame has been specifically defined to maintain the calciculture media and their continuity. It is the sectors identified in this sub-trame that make up the bulk of the programme’s area of action for the upper-Norman part.For the former low-Norman territory, the SRCE has defined a more general “open land” sub-trame, integrating all limestone habitats. On the basis of these two information, a first mapping of open calccultural environments was carried out in 2018 and 2019. This layer is available on the CARMEN tool and provides summary information on all the limestone slope perimeters identified in Normandy.Most of the identified lawns are now abandoned and present a risk of bushing and afforestation in the medium term. In fact, apart from primary lawns, traditional extensive grazing is at the origin of the creation of most calciculture lawns, so that the agricultural decline of recent decades has, conversely, encouraged closure (Bensettiti et al. (coord.), 2005).This pastoral activity on hillsides and limestone lawns is now economically unsustainable and most of the hillsides are now abandoned, with the exception of some sectors where breeding is still present as in the Pays d’Auge or the Pays de Bray.