Lake Nicaragua in Nicaragua is the only fresh water lake in the world that has sharks.

False - while original thought that the sharks found in Lake Nicaragua were their own species that were stranded and branched millions of years ago during the formation of the lake, these sharks were found to be the widespread Bull Shark, and were able to jump along the rapids of the San Juan River which connects the lake to the Caribbean Sea.  In turn, the Bull Shark has quite a tolerance for freshwater and can be found in many lakes and rivers throughout the world.

original claim: @OMGFacts; source: wikipedia

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