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This indicator tracks changes over time in the extent of water-related ecosystems, which includes the following categories: wetlands (swamps, marshes and peatlands), open water (rivers and estuaries, lakes, coastal waters and reservoirs) and groundwater aquifers. A combination of earth observation and ground-based data will be applied. Three principal aspects (spatial extent, quantify of water contained within these ecosystems and the health or state of these ecosystems) are monitored.

More information can be found in the Methodology and Metadata for SDG Indicator 6.6.1 and on the SDG 6 Monitoring UN Water site: