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%
123
flagthe Netherlands
31%
4%
54%
9%
22
flagGreece
6%
10%
53%
30%
30
flagAustria
9%
27%
52%
10%
55
flagIndia
11%
29%
50%
8%
34
flagPoland
19%
17%
48%
14%
4446
flagthe United States
20%
17%
44%
14%
189
flagSwitzerland
20%
20%
40%
20%
20
flagGermany
24%
23%
33%
17%
218
flagCanada
35%
23%
23%
17%
17