Peri-urban spaces are areas where new relationships between the city and the countryside are being fostered and new lifestyles are being reinvented. Subjected to social demand, peri-urban landscapes combine open spaces and built-up areas. The choice of Alpine cities is relevant because of their proximity with the larger mountain landscape and the diversity of their “ordinary” landscapes. This article provides feedback on a project for the creation of a network of metropolitan areas combining landscapes and green infrastructures. The diversity of terrains and the inter-cultural context raise questions about how public landscape policies are defined, in the sense that these are conditioned by the respective positions of stakeholders in an action research perspective. We will analyse the relationship between transnational cooperation in defining landscape policies in a given territory and an urban planning context, which is sometimes restrictive, to reflect on how converging modes of action on the landscape can be defined.