In recent decades, international law has undergone a series of major developments in order to accommodate the many new facets of freshwater management and protection. The adoption of universal, regional and basin instruments highlights how important it is to study the evolution of international water regulations and to be able to identify the main principles in this field. This course aims to provide the necessary background to understand and examine the regulation applicable to transboundary freshwaters especially to rivers, lakes and aquifers. It presents the principles and legal standards that govern the use, sharing, management and protection of these resources. The MOOC is made up of 5 modules. As each module addresses a different theme, they can be viewed in any order. However, the modules do follow a certain pedagogical logic and following in order will be especially helpful to those who are new to the subject. Each module is accompanied by an evaluation questionnaire or quiz. A certificate will be awarded to students who obtain an average of at least 80% in the quizzes. By the end of this course, you will be able to: 1) Describe the issues related to the regulation of transboundary freshwaters; 2) Explain how transboundary freshwater regulations have evolved; 3) Recall and interpret the key principles governing water resource regulation; 4) Understand the role of transboundary freshwater dispute settlement mechanisms in the development of international freshwater law (or to understand the role of international courts and tribunals in the resolution of conflicts) This MOOC was developed by the Platform for International Freshwater Law that is part of the Geneva Water Hub, assisted by the MOOC Team of the University of Geneva. Alongside the researchers and teachers of the Platform, several international experts have also participated. This MOOC is one of three courses supported by the Water Hub Geneva and the University of Geneva. The other MOOCS are "Water Management and Policy" (www.coursera.org/learn/gestioneau) and "Ecosystem Services: a method for sustainable development "(www.coursera.org/learn/ecosystem-services). The Global Water Program of the Swiss Agency for Development and Cooperation (SDC) has funded this course. This MOOC was originally created in French. It has English subtitles.