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%
37
flagGreece
11%
5%
70%
11%
17
flagIndia
0%
22%
61%
16%
18
flagthe United Kingdom
13%
14%
58%
13%
68
flagthe Netherlands
25%
8%
58%
8%
12
flagPoland
21%
17%
45%
14%
2943
flagthe United States
23%
13%
43%
15%
119
flagSwitzerland
27%
27%
36%
9%
11
flagGermany
24%
24%
31%
19%
66
flagAustria
10%
40%
20%
30%
10