In the Copper Canyons of northern Mexico is a remote and wild terrain where the CB Ultra race is held. This 75km race was featured in the book 'Born to Run' and is considered to be very special among ultra runners.
- Poor
- Nothing special
- Worth watching
- Pretty cool
- Awesome
- Aired Jun 02, 2014
- Episode 2x10
- Show special No
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- Tardischild3 stopped following Boundless. Jan 03, 2023
- Tardischild3 is following Boundless. Jul 25, 2022
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