AUTHOR=Frappart Frédéric , Merwade Venkatesh M. TITLE=Editorial: Groundwater systems worldwide JOURNAL=Frontiers in Earth Science VOLUME=10 YEAR=2022 URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.1097789 DOI=10.3389/feart.2022.1097789 ISSN=2296-6463