World Water Day 2022 Theme: The theme of World Water Day 2022 is "Groundwater: making the invisible visible". Groundwater is the largest source of fresh and usable water in the world. Check World Water Day 2022 Significance and History here.
source https://www.jagranjosh.com/current-affairs/world-water-2022-theme-date-importance-of-groundwater-and-history-1647916190-1