The document discusses legal regimes for environmental protection and governance of transboundary natural resources in the La Plata Basin region of South America. The La Plata Basin covers parts of Argentina, Bolivia, Brazil, Paraguay and Uruguay. While the countries have developed environmental laws and policies, differences between legal frameworks can cause challenges for managing shared natural resources. The presentation analyzes the environmental laws and constitutions of the five countries, finding some similarities but also gaps between legislation and implementation. Improving governance will require further harmonizing legal and institutional frameworks to facilitate cooperative management of critical transboundary issues.