This dataset provides catchment boundaries, hydro-meteorological timeseries and landscape attributes for 671 catchments across Great Britain. It collates river flows, river levels, groundwater levels, precipitation, potential evapotranspiration and temperature time series at monthly to hourly timescales. Daily hydro-meteorological timeseries are provided from 1st October 1970 – 30th September 2022, hourly hydro-meteorological timeseries are provided from 1st October 1990 09:00 to 1st October 2022 08:00, and groundwater level timeseries cover a range of time periods (ranging from 7 – 72 years with the earliest records beginning in the 1950s). A comprehensive set of catchment attributes are quantified describing a range of catchment characteristics including topography, climate, hydrology, land cover, soils, hydrogeology, hydrometry and human influences. Full details about this dataset can be found at https://doi.org/10.5285/9a46d428-958f-4ac1-86eb-94eee70c0955