Until now, no one knew for sure how many lakes exist on Earth.
Blame geography — most of the world's lakes are in places where humans don't live, said David Seekell, an environmental scientist at Umea University in Sweden. "This is something one would have assumed had been done long ago, and was in a textbook somewhere," Seekell said.
Lots o' Water! 117 Million Lakes Dot Earth, Most Accurate Survey Finds