The Revenant: 200km & 16,000m-ish of vertical ascent, or possibly a wee bit more. Unsupported individual Ultra Adventure Run. Map and compass only. No watches allowed. You have 60 hours to complete the challenge, if you can tell when 60 hours is up.
The Revenant is held on Welcome Rock located above Garston in Southland New Zealand. The course you navigate covers a huge variety of terrain from alpine tussock land to Fiordland-like Beech forest. You'll be hot, you'll be cold, you will get wet and have little time to sleep. It could even snow. Can you finish? Maybe not.
Miners navigated their way across this unforgiving wilderness in search of gold. A few got rich. Most didn't. You'll race across the same unforgiving terrain, with a similar chance of success.
A true challenge is when failure is the most likely outcome.