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Our paper analyses the conceptual basis of the concept of ecological solidarity, a core feature of the 2006 law reforming National Park policy in France. Based on lessons learnt from the original 1960 policy, we show the multidimensional nature of ecological solidarity and how it is based on the recognition of the natural spatial interdependence among natural organisms and their physical environment. This sets the scene for a new vision of nature conservation. Ecological solidarity offers a pragmatic compromise between ecocentric and anthropocentric ethics. We designed a typology of ecological solidarities that integrates the diverse functional aspects of the organization and dynamics of biodiversity at different spatial and temporal scales. This typology departs from the previous model of central and buffer zones and sets protected areas within their wider social and ecological contexts. We outline how this gives sense to the elaboration of ecological networks and to the integrated management of cultural landscapes. Its efficient integration into land planning and conservation management strategies will require, however, the collective exploration by local communities and stakeholders of the diverse facets of ecological solidarity.