The catchment areas are more consistent between sources. However, in low relief the watershed is less obvious, while underground connections (especially in karst systems) further complicate area measurements. Unless excellent sources are available, the areas below 70°N latitude are taken from the HydroBASINS project.HydroBASINS at the HydroSHEDs website The River Networks and Ramsar Sites Information Service websites provide convenient interfaces to assess the accuracy of many of the basins. Areas for rivers above 70°N are warned and found to be less reliable.
The catchment areas are more consistent between sources. However, in low relief the watershed is less obvious, while underground connections (especially in karst systems) further complicate area measurements. Unless excellent sources are available, the areas below 70°N latitude are taken from the HydroBASINS project.HydroBASINS at the HydroSHEDs website The River Networks and Ramsar Sites Information Service websites provide convenient interfaces to assess the accuracy of many of .the basins Areas for rivers above 70°N are warned and found to be less reliable.