This research, applied to a cross-border mountain territory listed since 1997 as a World Heritage Site under the dual title of "natural landscapes" and "cultural landscapes", aims to explore the actual and potential relationships that landscape protection/management/labelling policies have with the perspective of sustainable development of territories. This work combines the analysis, over time, of the policies themselves with that of the landscapes concerned. The combination of these two interdisciplinary research approaches, implemented here simultaneously, has a double objective: (i) to present an analysis and an evaluation of policies, in particular that of the World Heritage, in their links with the dynamics of the landscape and the evolution of the perceptions of which the latter is the subject; (ii) to identify the stakes, to propose a problematic framework and tools for a landscape policy centred on the quest for a sustainable development of the territory concerned.