Hydrogeology, the science of underground water, is becoming increasingly important in terms of quantitative and qualitative groundwater protection. Our publications not only describe the chemical and physical properties of water, but also highlight the importance of water in everyday life and the political and social challenges associated with it. For prospective geoscientists we recommend, for example, the Hydrogeology Journal , the book series Cave and Karst Systems of the World and the Encyclopedia of Lakes and Reservoirs , all of which are publications that facilitate entry into hydrogeological projects.