Indicator 6.6.1 tracks changes over time in the extent of water-related ecosystems. It uses the imminent date of 2020 in order to align with the Aichi Targets of the Convention of Biodiversity, but will continue beyond that date to align with the rest of the SDG Targets set at 2030. Whereas all ecosystems depend on water, some ecosystems play a more prominent role in the provision of water-related services to society. Consequently, one of the focuses for global monitoring of this indicator is lakes. The indicator responds to Target 6.6: By 2020, protect and restore water-related ecosystems, including mountains, forests, wetlands, rivers, aquifers and lakes and seeks to provide data and information to enable management and protection of water-related ecosystems so that ecosystem services, especially those related to water and sanitation, continue to be available to society.