Quadripoints
A quadripoint is a point in the world where 4 borderlines meet. Those lines don't have to be from 4 different countrys. Actually it can't be 4 different countrylines because such place doesn't exist anymore on earth.
It did exist until 1920 at Vaals (Nl) where border of Belgium, Germany, Netherlands and neutral Moresnet met.
Neutral Moresnet
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