 The CAMELS data set provides a comprehensive collection of catchment attributes for 671 catchments in the contiguous United States, CONUS, which can be used for large-scale hydrologic studies. These attributes include topography, climate, streamflow, land cover, soil and geology. Additionally, the data set includes a time series of meteorological forcing and streamflow from Newman et al., 2015 B. This data set is unique because it combines multiple sources of data to provide a comprehensive description of catchments, making it ideal for large-scale studies. This article was authored by N. Adder, N. Adder, A. J. Newman and others.