The goal of this article is to describe the realisation of the Inner Area National Strategy (Snai), a policy which aimes to approach the issue of the persistent depopulation of specific territories, keeping under consideration the distinctive conditions of the mountainous region of the Area surrounding Venice. The focus of the paper is to analyse the ways this policy is used to pursue the integration of the national resources of the Annual Budget Law and the different Structural and Investments European Funds managed by the Venetian Region in the period between 2014 and 2020. Furthermore, the role of Mountain Municipalities Unions will be examined in the different Areas addressed by the Snai and aims to demonstrate the inevitability of cooperation for a successful inter-municipal management. The cooperation requirement is, in fact in the author's opinion, unavoidable factor for the activation of en-dogenous development patterns to assure the offer of essential services, which will lead to an economical growth sustainable in the long run. Lastly, the author will analyse the innovative participatory approach which is promoted by the Snai in the above mentioned Areas, paying specific attention to the method of the "open diagnosis" and "co-planning".
Keywords: Inner Areas, Inter-Municipality Cooperation, Structural and Investments Eu-ropean Funds 2014-2020, Co-Planning, Local Development