what's the area immediately located back of both knees from outside called?!

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The area of the leg behind the knees, (not inside the joint, i.e. the part you can touch from the outside) is called the "popliteal" region or area.

Other Answers:
Honestly, it's called the back of the knee. I know it sounds stupid, but that's what it's called.

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if you are referring to the bit that feels stringy or something, that is the ham string, this is the cartlidge and muscle that helps control actions of your leg.

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