Which of these rivers flows into the sea via estuary?

Vistula
Volga
Thames
Danube
An estuary is a partially enclosed coastal body of brackish water with one or more rivers or streams flowing into it, and with a free connection to the open sea. The Thames flows into the North Sea via the Thames Estuary. The other listed rivers leave its mouth via delta.
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Answers by country

Vistula
Volga
Thames
Danube
answers
flagItaly
0%
0%
97%
2%
41
flagAustralia
0%
11%
72%
16%
18
flagGreece
9%
4%
71%
14%
21
flagFrance
10%
0%
70%
20%
10
flagthe Netherlands
21%
7%
64%
7%
14
flagthe United Kingdom
14%
16%
56%
12%
74
flagIndia
5%
25%
55%
15%
20
flagPoland
21%
17%
46%
14%
3254
flagthe United States
21%
15%
43%
15%
133
flagSwitzerland
25%
25%
33%
16%
12
flagGermany
21%
25%
31%
20%
88
flagAustria
15%
38%
23%
23%
13