The Badwater Ultra-Marathon is one of the world's toughest footraces.

For the fastest runners, it will take 24 hours to complete.

More than 200 kilometres and three mountain ranges lie in wait.

In the summer, the temperature never falls below 40C (100F). 

You must be crazy to take part. But 97 athletes from more than 24 countries will do just that.

Gabriel Elizondo reports from the Death Valley in California.

Source: Al Jazeera