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Area refers to the total area of the basin in square kilometres, and basins are ordered from largest to smallest. ‘Number lakes’ is the number of lakes in the basin receiving at least two ICESat-2 observations over the 22-month study period, and ‘Number reservoirs’ refers to the number of these that are marked as reservoirs in the GRanD and/or GOODD databases. ‘Water level variability’ refers to the median range (maximum minus minimum) in observed water level across all water bodies in the basin (in metres). We report the observed value along with the lower and upper bounds due to uncertainty in height retrievals calculated from comparison with in situ gauge measurements. ‘Non-reservoir variability’ and ‘Reservoir variability’ report these same values but just for natural water bodies and reservoirs. The ‘Total storage change’ is the total sum of variability in storage in the basin over the October 2018 to July 2020 period. Finally, ‘% storage change due to reservoirs’ refers to the per cent of this total surface water storage variability associated with reservoirs.