There are many craters on the surface of Mars
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Millions of years ago, when a single small meteorite hit Mars, it didn’t just create a single crater. Eventually it produced billions of them. The main crater, called Corinth, is just under 8 miles (14 kilometers) across, but about 2 billion additional craters, called secondary craters, were formed by debris from the meteorite impact.
When a meteorite hits the ground, it can send huge plumes of rock into the air. As these rocks fall, they form their own chain of small craters.
Source: www.newscientist.com
