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
31%
50%
6%
12%
16
flagIndia
26%
36%
18%
18%
160
flagthe United States
28%
33%
25%
11%
96
flagGermany
34%
30%
10%
26%
50
flagCanada
28%
28%
14%
28%
14
flagPoland
32%
27%
22%
16%
2542
flagthe United Kingdom
32%
27%
21%
18%
37
flagAustralia
36%
26%
26%
10%
19
flagUnknown
26%
20%
26%
26%
15
flagRepublic of Ireland
50%
20%
20%
10%
10
flagPakistan
33%
13%
40%
13%
15