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How deep are the canyons cut by the Rio Grande in the Big Bend region?
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Rio Grande
The Rio Grande basin and its drainage network.
In the Big Bend region, the Rio Grande has carved three distinct canyons that reach depths between 1,500 and 1,700 feet (460 and 520 metres). These canyons, which include the Santa Elena, Mariscal, and Boquillas, are cut through layered limestone, sandstone, and volcanic rock within the area occupied by Big Bend National Park.12