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
3%
0%
86%
9%
51
flagAustralia
3%
9%
74%
12%
31
flagRepublic of Ireland
4%
12%
64%
20%
25
flagFrance
14%
7%
64%
14%
14
flagRomania
27%
0%
63%
9%
11
flagIsrael
0%
30%
60%
10%
10
flagthe United Kingdom
12%
12%
58%
16%
124
flagthe Netherlands
30%
4%
56%
8%
23
flagAustria
9%
27%
52%
10%
55
flagGreece
9%
9%
51%
29%
31
flagPoland
19%
17%
48%
14%
4482
flagIndia
10%
27%
48%
10%
37
flagthe United States
20%
17%
45%
14%
192
flagSwitzerland
19%
23%
38%
19%
21
flagGermany
22%
23%
33%
18%
235
flagCanada
35%
23%
23%
17%
17