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
28%
57%
7%
7%
14
flagIndia
23%
38%
16%
20%
121
flagGermany
25%
32%
9%
32%
31
flagthe United States
30%
30%
25%
12%
72
flagCanada
20%
30%
20%
30%
10
flagPoland
32%
27%
23%
16%
2328
flagthe United Kingdom
36%
23%
20%
20%
30
flagUnknown
26%
20%
26%
26%
15
flagAustralia
50%
20%
20%
10%
10
flagPakistan
20%
10%
50%
20%
10