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50 Longest Rivers in the World

Every time you guess an answer, you will be shown one letter from each of the 9 answers below (the 2nd letter of the answer below, the 3rd of the answer 2 places below etc). This means that reading 'diagonally' (going up-right, starting from the answer above the one you're looking for) letters of the same colour as the rank number you'll be able to get a good hint (but not the initial letter!).
Answers from Wikipedia
Length shown in km
Quiz by scambigol
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Last updated: November 5, 2015
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First submittedNovember 5, 2015
Times taken2,491
Average score44.0%
Rating4.73
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Rank
Length
River
Letters of other answers
1
6,650
Nile
m n s s w . . . .
2
6,400
Amazon
a s i o . . . . .
3
6,300
Yangtze
i n l . á . . . .
4
6,275
Mississippi
e l . n . . . . .
5
5,539
Yenisei
e . a o . . . e .
6
5,464
Yellow
b r g . . . i . .
7
5,410
Ob
a n r . g z . . .
8
4,880
Paraná
o u a n n . . s .
9
4,700
Congo
m n o e . . n . A
10
4,444
Amur
e k k r y i . - .
11
4,400
Lena
e c e a t . l . .
12
4,350
Mekong
a g r n . a . . .
13
4,241
Mackenzie
i r a a . a . . .
14
4,200
Niger
u c g t r . . . i
15
3,672
Murray
o l t i . . . c .
16
3,650
Tocantins
o a e s . . n a .
17
3,645
Volga
h d ú n . a y . r
18
3,596
Shatt al-Arab
a r o s r r . w e
19
3,380
Madeira
u k u F a n a d g
20
3,211
Purús
u d . D e L n n r
21
3,185
Yukon
n o . e . a u t .
22
3,180
Indus
ã r w t r T u . .
23
3,180
São Francisco
y l n G . p . . .
24
3,078
Syr Darya
a i . r a . . . .
25
3,060
Salween
a o e m e i . . .
Rank
Length
River
Letters of other answers
26
3,058
Saint Lawrence
i w h b z . a . .
27
3,057
Rio Grande
o a u e y i . a .
28
2,989
Lower Tunguska
r n b u a . y . .
29
2,948
Brahmaputra
a m y u s r . . .
30
2,888
Danube
a l g e a . . . .
31
2,693
Zambezi
i a g D á . y . .
32
2,650
Vilyuy
r n . r n a . o .
33
2,627
Araguaia
a u u o u . y . .
34
2,620
Ganges
m p s g a a . . .
35
2,620
Amu Darya
a l a m m . . . .
36
2,615
Japurá
e r y o . . . . .
37
2,570
Nelson
a l c n . . . . .
38
2,549
Paraguay
o l u m . . s . .
39
2,513
Kolyma
i t i á . a o . .
40
2,500
Pilcomayo
a h u . s d . . .
41
2,490
Katun
s r l n a k . . .
42
2,450
Ishim
u a a r o r . .
43
2,410
Juruá
r k o y e . .
44
2,428
Ural
r l n p . .
45
2,348
Arkansas
o e e n i
46
2,333
Colorado
l i a g
47
2,292
Olenyok
n d n
48
2,287
Dnieper
l a
49
2,273
Aldan
b
50
2,270
Ubangi
Quizzer6794
+1
Level 65
Nov 5, 2015
In the previous version, you lapped around (e.g. for Ubangi you would put N M N S S O . .)
scambigol
+1
Level 76
Nov 6, 2015
True but this time I thought you should manage to find the first one with no hints, the second with just one letter hint etc
bluesdjben
+3
Level 74
Dec 23, 2016
I was a little confused by the fact that tributaries that are the farthest source of a system, such as the Missouri and Irtysh, are not considered, while other tributaries are. I realized this with about 1:15 left and then started typing tributaries as quickly as possible.
NQChien
+2
Level 66
Aug 8, 2018
Yes, why are Purús and Madeira counted whereas Missouri is not?
Gumbledalf
+4
Level 71
Apr 1, 2021
The English Wikipedia list has terrible methodology. Some of the river lengths are grossly wrong (most importantly for Rio Tocantins which is 1000 km shorter, wrong lengths for Zambezi, Amu Darya, and Nelson also shuffle many positions), and it sometimes randomly includes tributaries while excluding them at other times, and at times goes by names rather than lengths. Rio Madeira, Rio Purus, Rio Japura and Rio Jurua are tributaries of the Amazon, Vilyuy and Aldan are tributaries of Lena, Ganges and Brahmaputra merge into the Padma–Meghna, the Lower Tunguska is a tributary of the Yenisei, Rio Araguaia of Rio Tocantins, Rio Paraguay of Rio Parana and Rio Pilcomayo of Paraguay–Parana, Katun of Ob, Ishim of Ob–Irtysh, Arkansas of Mississippi and Ubangi of Congo. The Orinoco should appear with over 3000 km, instead of Dnieper. The German Wikipedia list is much better with the main rivers, but its name-based semirandom tributary selection is still confusing.
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