What is the largest affluent of the Baltic Sea in terms of mean discharge?

Vistula
Neva
Daugava
Neman
Vistula is the longest of the Baltic Sea affluents, but its mean discharge of 1080 m3/s is less than half of Neva (2500 m3/s). Other major Baltic Sea effluents are Daugawa nad Neman (both 678 m3/s).
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Answers by country

Vistula
Neva
Daugava
Neman
answers
flagItaly
7%
85%
7%
0%
14
flagIndia
16%
36%
44%
4%
25
flagthe United States
33%
30%
25%
8%
62
flagthe United Kingdom
45%
25%
25%
5%
40
flagPoland
44%
24%
11%
18%
4052