Extended Data Fig. 1: Overview of the algorithm that identifies river deltas using HydroSheds data.

a, HydroSheds drainage basins and the included deltas are shown for Veracruz, Mexico. b, Close-up of a, showing the included deltas and the tracked river channel for the channel slope calculation. Scale bars show the resolution of the WaveWatch⁴⁷ and TOPEX datasets⁵⁰.