The surface area measurements reported here have been extracted from the Global Surface Water Explorer (GSWE). These figures may or may not match national figures on water body extent and have not been nationally validated. A permanent water surface is underwater throughout the year (whilst a seasonal water surface is underwater for less than 12 months of the year). This indicator includes areas which have been identified as permanent plus areas of uncertainty that have identified as likely being permanent. Metadata: https://environmentlive.unep.org/media/docs/projects/metadata_6_6_1.pdf, https://unstats.un.org/sdgs/metadata/files/Metadata-06-06-01a.pdf, https://unstats.un.org/sdgs/metadata/files/Metadata-06-06-01b.pdf