What is the strongest muscle in the body and were is it located?

Depending on your definition of strong, there are multiple answers to this question.
1) The masseter (in the jaw) is recognized by the Guiness Book of World Records to be the strongest muscle in the human body. The greatest force exerted by any human jaw is recorded to be 4,337 newtons
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Also, a common misconception is that the tongue is the strongest muscle in the body. This is wrong, because the tongue is in fact composed of eight different muscles, it it not just one big muscle.