- This national park features a canyon that is 277 river miles long, up to 18 miles wide and a mile deep.
- Nearly 5 million people visit this park every year. 90% of those visitors see the features from overlook sites while less that 10% of visitors really explore the geologic features of this park.
- President Theodore Roosevelt said of this area, "Leave it as it is. The ages have been at work on it, and man can only mar it. What you can do is to keep it for your children, your children's children, and for all who come after you, as one of the great sights which every American should see."
- Well known for its geologic significance, this is one of the most studied geologic landscapes in the world. It offers an excellent record of three of the four eras of geological time, a rich and diverse fossil record, a vast array of geologic features and rock types, and numerous caves containing extensive and significant geological, paleontological, archeological and biological resources.
- The main outdoor adventure activities within this park are white water rafting and hiking the length of the canyon, which is an overnight trip for most hikers.
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