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Longest Tributaries

These are the world's longest rivers that flow into a another river that is even longer.
Names are irrelevant here – for example, at the confluence of Mississippi and Missouri the Missouri is longer, so the upper Mississippi is the tributary.
The last entry is also the world's longest tributary of a tributary!
Quiz by Gumbledalf
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Last updated: November 20, 2022
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First submittedNovember 20, 2022
Times taken5
Average score31.8%
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length (km)
Flows into
Tributary
~3400
__–Irtysh
Ob via Chulym until Irtysh
3380
Amazon
Madeira via Mamoré and Grande
3283
Amazon
Juruá
3210
Amazon
Purus
2989
Yenisei
Lower Tunguska
2816
Amazon
Japurá
2650
Lena
Vilyuy
2620
Brahmaputra–Padma
Ganges via Bhagirathi
2549
Paraná
Paraguay
2450
Irtysh
Ishim
2400
Amazon
Negro via Vaupés
2364
Mississippi
Arkansas
2291
Amazon
Tapajós via Teles Pires
2273
Lena
Aldan
2272
Congo
Ubangi via Uele
2188
Mississippi
Red River via Tierra Blanca
2153
Congo
Kasai
2106
______–Angara
Yenisei via Little Yenisei until Angara
2102
Mississippi
Ohio via Allegheny
2021
_______–Araguaia
Tocantins until Araguaia
2011
Paraná
Salado del Norte
1999
_______, then Paraná
Pilcomayo
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