The largest canyon in the solar system cuts a wide swath across the face of Mars. Named Valles Marineris, the valley extends more than 3,000 kilometers (1,865 miles) long, 600 kilometers (373 miles) wide, and as much as 8 kilometers (5 miles) deep.

Photograph courtesy NASA

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canyon
canyon Encyclopedic Entry

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5-12+

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Religion, Geography

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Encyclopedic entry. A canyon is a deep, narrow valley with steep sides.