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.
Detailed methodology is shown in this document, click here for any other language. the detailed metadata is shown in this document. The integrated monitoring of water and sanitation related SDG targets can be found on this site while the further information on methodology for all of SDG 6 indicators can be found in the UN-Water metadata compilation.