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
15%
70%
15%
0%
20
flagAustria
0%
58%
33%
8%
12
flagthe United States
23%
54%
16%
4%
142
flagAustralia
41%
54%
0%
4%
24
flagRepublic of Ireland
38%
50%
5%
5%
18
flagthe Netherlands
30%
40%
10%
20%
10
flagthe United Kingdom
31%
38%
22%
7%
83
flagIndia
24%
36%
34%
4%
41
flagGermany
22%
27%
30%
19%
62
flagPoland
42%
26%
13%
17%
5015
flagGreece
33%
22%
38%
5%
18