The promotion of tangible and intangible heritage has become an essential linchpin for tourism, which generates significant economic spin-offs in different sectors of activity. Today, however, local development cannot be considered without taking the social and environmental challenges into account, with a view to sustainable development. The partners of the project therefore set out to design and test innovative and creative solutions for the sustainable development of cross-border cultural and natural heritage, with the goal of enhancing the appeal and the sustainable development of the territory. Cross-border collaboration in the context of this project is essential because there are differences in the sustainable development vision and practices on both sides of the border. The implementation of complementary and coordinated actions will allow for a common progression of the partners and will be beneficial to the populations of the three sides of the cross-border area.