Valles Marineris, a vast canyon system on Mars, is roughly how long?
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Valles Marineris is an immense canyon system that spans about 4,000 kilometers (2,500 miles) across the Martian equator. To put that in perspective, it is roughly the width of the continental United States and significantly larger than Earth's Grand Canyon, making it one of the largest canyons in the Solar System. Its formation is still debated, but it's likely linked to tectonic activity and crustal stretching. Photo: NASA / USGS (see PIA04304 catalog page), Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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