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Mars - Valles Marineris (B)
Part of the canyon system that would stretch across the United States.
The actual model file, as it will be printed. Drag to turn it.
Valles Marineris runs some 4,000 kilometres along the Martian equator and drops as much as seven kilometres deep. The Grand Canyon would be a side branch.
Published by NASA in their 3D Resources collection, which they state is free of copyright. Printed to order — scaled to about 80 mm on its longest side, and resizeable on the next page.