World Water Day is on 22 March every year. This year’s theme is ‘groundwater’ and draws attention to the hidden water resource that has always been critically important but not fully recognized in sustainable development policymaking. To raise awareness on sustaining groundwater, Elsevier presents a curated list of publicly available journal articles and book chapters. At Elsevier, we are advancing #SDG6 research and ensuring that #groundwater is sustainably explored, analyzed, and monitored