The Danube river is one of the world's greatest international freshwater resources. It stretches halfway across Europe and passes through 11 countries. Its catchment is shared by 17 nations, many of whom are new members of the expanded European Union. This book focuses on the disputed Gabcikovo-Nagymaros Project on the Danube between Hungary and the Slovak Republic. It examines the history and progress of the case from the International Court of Justice to the subsequent agreement to joint monitoring and assessment of the environmental implications.