The Yarlung Zangbo Grand Canyon, found in __, is the world's deepest canyon. |  |
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 | Numbers Don't Lie |
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 | Estimated number of caves within the Grand Canyon | 1,000 |
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|  | Miles of the Colorado River that run through the Grand Canyon | 278 |
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 | Species of rattlesnakes found in Grand Canyon National Park (including the pink Grand Canyon rattlesnake, only found there) | 5 |
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|  | Visitors to Grand Canyon National Park in 2022 | 4.7 million |
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 | Mail is delivered to the bottom of the Grand Canyon. |
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Most visitors to the Grand Canyon admire the landscape from overlooks, never venturing to the gorge's bottom. Yet mail-carrying mules trek down into the canyon five days a week, delivering packages, food, and supplies to the Supai village, where the Indigenous Havasupai people have lived for nearly 1,000 years. (It's unclear how long mail has been delivered this way, but mule postal deliveries were first documented in 1938.) Up to 22 mules are part of the daily, all-weather mail train, carrying up to 200 pounds of goods each, and traveling 9 miles down into the canyon outside the national park's boundaries. The trip takes three hours down and five hours on the return, and according to the Smithsonian's National Postal Museum, is the last official mail-by-mule route in the country (and possibly, the world). | |
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