This report aims at integrating regional and country experiences and projects with regard to viable groundwater management practices for the future. It compiles and translates best available present scientific and technical knowledge on groundwater resources and their governance, which is often highly specialized, into simpler language and synoptic representations, accessible to a large public of policy and decision makers across development sectors. It serves as a technical basis for the visioning process, and for the definition of the Framework for Action on groundwater governance.This is one of 3 outputs of project GCP/GLO/277/GEF expected to be published under the names of its 5 partner organizations and widely circulated to policy and decision-makers in countries, as well as other stakeholders of groundwater governance and practionners around the world. This outputs provides the technical basis for the other two: A Global Vision for Groundwater Governance 2030 and Global Framework for Action to Achieve the Vision on Groundwater Governance.