The residents of Bella Unión promoted the creation of a Natural Protected Area in Rincón de Franquía, on the triple border with Argentina and Brazil. The objective was to protect the valuable biodiversity of the area, carry out environmental education to support conservation and develop nature tourism. To this end, they formed a local NGO: GRUPAMA. After a long process, they managed to get the area into the National System of Protected Areas. Now, together with NGOs and local authorities from neighboring cities in Argentina and Brazil, they are seeking to implement a Trinational Biological Corridor. It is hoped that this will allow, in addition to conservation and the enjoyment of the citizens of the area, the creation of a nature tourism offer that will promote post-pandemic economic reactivation. The innovation is given by the protagonism of the CSOs in the whole process, both locally and in the articulation with other NGOs and the authorities to create a transboundary natural protected area.