The Amazon rainforest is well-known as one of the last bastions of unexplored wilderness on earth. There are still regions of its deep jungle which harbor native tribes who have had little to no contact with the modern world. It's also an incredibly difficult environment to survive in — millions of square miles of dense vegetation, harsh terrain, constant moisture, and countless poisonous or venomous species. Even for experienced survivalists, overcoming the Amazon is a serious challenge.

A new movie, Jungle with Daniel Radcliffe, tells the true story of four men who entered the Bolivian rainforest, only to learn firsthand how difficult it can be to survive there. The men remained in the jungle for three weeks with only basic supplies, and tragically, some of them never made it out.

Radcliffe plays the role of Yossi Ghinsberg, a 21-year-old adventurer who had decided to travel the world after serving in the Israeli military. The film is based on the book Ghinsberg wrote to tell how he escaped alive, Jungle: A Harrowing True Story of Survival. Check out the trailer for Jungle below:

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If you're interested in hearing more about this true survival story, watch the video below to hear it in Ghinsberg's own words:

Written by Patrick McCarthy