What is the worlds largest watershed

Answers:
According to Wikipedia, the three largest river basins/watersheds by area in descending order are: the Amazon basin, the Congo basin, and the Mississippi basin.

However, if you list rivers by drainage area, you get:

Amazon - 6,915000 km2
Río de la Plata - 4,144,000 km2
Congo - 3,680,000 km2
Nile - 3,349,000 km2
Ob - 2,990,000 km2
Mississippi - 2,980,000 km2
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