With the launch of Sentinel-3A (2016) and Sentinel-3B (2018), the Copernicus programme has a constellation of two SAR altimeters, which provides an operational access to inland Water Surface Height (WSH) data (i.e., lakes and rivers), with outstanding product performance and data coverage. To further improve the performance of the Sentinel-3 Altimetry LAND products, ESA is developing dedicated and specialized Level-1 and Level-2 processing chains for all S3 Altimetry Land surfaces, i.e., over Inland Waters and...