 E.R. Interim Slash Land is a 32-year land surface reanalysis data set that describes the evolution of soil moisture, temperature, and snowpack using the latest ECMWF land surface model driven by meteorological forcing from the E.R. Interim Atmospheric Reanalysis. It has a horizontal resolution of about 80 kilometers and a time frequency of 3 hourly. The data set includes parameterization improvements in the land surface scheme, making it suitable for climate studies involving land water resources. The quality of E.R. Interim Slash Land is assessed by comparing with ground-based and remote sensing observations, and it provides a global integrated and coherent estimate of soil moisture and snow water equivalent that can be used for numerical weather prediction and climate model initialization. This article was authored by G.Balsamo, C. Albregel, Abel Jars, and others.