The Aïr-Ténéré National Natural Reserve is a protected area in which conservation and development principles tempt to be combined (co-management). To follow-up environmental changes which determine people's life, and to support decisions to manage the Reserve, the first steps of a territorial observatory are introduced. Beyond the technical build up of the Geographical Information System (GIS), the prototype proposed here is a concrete expression of a part of a territorial intelligent tool. It embraces all territorial dimensions from spatial to actors ones, and try in the context of the reserve, to revisit the definition of local governance. This work is based on a master thesis (Flety 2006).