6-9 December 2021 – UNESCO’s Intergovernmental Hydrological Programme (IHP) organizes the Second International UNESCO Conference on Transboundary Aquifers, “ISARM2021: Challenges and the way forward”. The conference is a milestone in advancing the knowledge on shared groundwater resources. More than 200 experts will participate from all around the world. It provides a unique opportunity to understand progress achieved over the past 10 years. It contributes to the achievement of the SDG 6 and the monitoring of the indicator 6.5.2 on transboundary cooperation. Several high level debates will explore how science can influence policy for the sustainable management of transboundary aquifers resources and will look at evolution in water cooperation.