Globally, invisible groundwater resources are under increasing pressure due to human activities and climate change. Our response to this pressure is often not adequate, also due to limited awareness of the importance of groundwater resources. This Groundwater Overview is prepared by IGRAC (International Groundwater Resources Assessment Centre) in cooperation with United Nations Educational, Scientific and Cultural Organization – International Hydrological Programme (UNESCO-IHP), International Association of Hydrogeologists (IAH), International Water Management Institute (IWMI) and with contributions of many UN Water Members and Partners, to showcase the essentials and the credentials of groundwater, placed within the broad spectrum of UN-Water Member’s and Partner’s activities. It is meant to inform about groundwater-related activities, to enhance knowledge exchange and collaboration, and to raise awareness about our most important hidden resource: groundwater. Read the full report here.