main_rivers ≥ 500 cells
Copernicus GLO-30 DEM at 180 m, D8 flow accumulation

tributaries ≥ 80 cells
Copernicus GLO-30 DEM at 180 m, D8 flow accumulation

headwaters ≥ 8 cells
Copernicus GLO-30 DEM at 180 m, D8 flow accumulation