Statistics for Million square km drainage basins

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Continent	Terminus	Area (sq km)	Answer	% Correct
South America	Atlantic Ocean	6,145,186	Amazon River	100%
Africa	Atlantic Ocean	3,254,853	Nile River	100%
Africa	Atlantic Ocean	3,730,881	Congo River	88%
North America	Atlantic Ocean	3,202,185	Mississippi-Missouri River	88%
Africa	Atlantic Ocean	2,261,741	Niger River	88%
Asia	endorheic basin	3,626,000	Caspian Sea	82%
Asia	Indian Ocean	1,621,000	Meghna-Padma-Ganges-Brahmaputra River	82%
North America	Atlantic Ocean	1,344,200	St Lawrence River	82%
Asia	Indian Ocian	1,081,718	Indus River	76%
South America	Atlantic Ocean	3,170,000	Río de la Plata	76%
Asia	Pacific Ocean	1,722,193	Yangtze River	76%
North America	Arctic Ocean	1,805,200	Mackenzie River	71%
Asia	Arctic Ocean	2,982,493	Ob River	71%
Africa	Indian Ocean	1,332,574	Zambezi River	71%
Australia	Southern Ocean	1,050,116	Murray-Darling Basin	65%
Asia	Pacific Ocean	1,929,955	Amur River	59%
Asia	Arctic Ocean	2,306,743	Lena River	59%
Africa	endorheic basin	2,497,738	Lake Chad basin	47%
Asia	Arctic Ocean	2,554,388	Yenisei River	47%
Asia	endorheic basin	1,618,750	Aral Sea	41%
Australia	endorheic basin	1,200,000	Lake Eyre Basin	41%
North America	Atlantic Ocean	1,072,300	Nelson River	18%