Dr. Nizar Ibrahim, an assistant professor of biology at the University of Detroit Mercy, is the lead author of a paper that describes the most dangerous place and time you could be standing on Earth.

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And the winner is: 100 million years ago in an area of rock formations in southeastern Morocco known as the Kem Kem Group.

These days, that area is along the northwestern edge of the Sahara desert. According to Fox News, 100 million years ago, the area featured a river system, filled with giant fish, that drew in animals, including large carnivorous dinosaurs. The river was also home to a 25-foot long, 3000 pound freshwater saw-toothed shark with an 8-foot snout. According to Dr. Ibrahim:

This was arguably the most dangerous place in the history of planet Earth, a place where a human time-traveller would not last very long.

I will not be going there in my time machine.

Here's the story.