The largest impact crater of the Solar System is:

Valles Marineris
Caloris
Rupos Altai
Aristarchus
Caloris Planitia is a plain within a large impact basin on Mercury, informally named Caloris, about 1,550 km in diameter. It is one of the largest impact basins in the Solar System. The crater, discovered in 1974, is surrounded by a ring of mountains approximately 2 km (1.2 mi) tall.
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Answers by country

Valles Marineris
Caloris
Rupos Altai
Aristarchus
answers
flagthe Philippines
27%
50%
5%
16%
18
flagGreece
0%
50%
0%
50%
12
flagAustria
33%
40%
0%
26%
15
flagFrance
40%
40%
0%
20%
10
flagIndia
26%
36%
19%
16%
204
flagthe United States
33%
30%
23%
11%
109
flagGermany
32%
28%
16%
21%
73
flagCanada
28%
28%
14%
28%
14
flagPoland
33%
27%
22%
16%
2755
flagSwitzerland
0%
27%
54%
18%
11
flagthe United Kingdom
33%
26%
20%
20%
45
flagAustralia
33%
23%
23%
19%
21
flagUnknown
26%
20%
26%
26%
15
flagRepublic of Ireland
50%
20%
20%
10%
10
flagPakistan
33%
13%
40%
13%
15