Limits RegistryPUBLIC RECORD
Limits RegistryValles Marineris on Mars stretches roughly 4,000 km — about a fifth of the planet's circumference — and reaches depths of up to 7 km in places, making it both the longest and one of the deepest known canyon systems in the solar system, dwarfing Earth's Grand Canyon (about 450 km long and up to 1.8 km deep). It likely formed through a combination of tectonic rifting and later erosion, rather than being carved by a river as the Grand Canyon was.
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Valles Marineris on Mars stretches roughly 4,000 km — about a fifth of the planet's circumference — and reaches depths of up to 7 km in places, making it both the longest and one of the deepest known canyon systems in the solar system, dwarfing Earth's Grand Canyon (about 450 km long and up to 1.8 km deep). It likely formed through a combination of tectonic rifting and later erosion, rather than being carved by a river as the Grand Canyon was.
The greatest total length of any known canyon system in the solar system, on any planet or moon.
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Limits Registry. LR-LARGEST-CANYON-SOLAR-SYSTEM. Largest canyon system in the solar system. 2026.