Ruby Canyon
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Ruby Canyon is a roughly 25 mile (40 km) canyon on the Colorado River located on the Colorado-Utah border in the western United States, and is a popular destination for rafting. The canyon takes its name from the red sandstone cliffs which line the canyon walls.
The only access to the canyon outside of rafting is provided by the Union Pacific Railroad (formerly Denver & Rio Grande Western) between Mack, Colorado and Westwater, Utah. Amtrak's California Zephyr follows this route through Ruby Canyon between Grand Junction, Colorado and Thompson Springs, Utah. A popular attraction along the route are the words "Utah Colorado" painted on the canyon wall at the border between the two states next to the Utaline Siding.