The concept of border actions has evolved over time and is beginning to be replaced by CA actions, which implies considering the regional context and articulating with other States. Thus, in recent years, strategic areas have been redefined where regional integration actions are beginning to be built based on proximity, quantity and intensity. cross-border relationships of various kinds that developed spontaneously in the past. Environmental protection and sustainable development of the Guarani Aquifer System (SAG) project Proposed actions for the integrated management of the cross-border Cuareim-Quaraí River Basin