"A pole of inaccessibility marks a location that is the most challenging to reach owing to its remoteness from geographical features that could provide access. The term describes a geographic construct, not an actual physical phenomenon, and is of interest mostly to explorers"
http://en.wikipedia.org/wiki/Pole_of_inaccessibility
Something I can't quite put my finger on fascinates me with the idea of this. It's like a non-place, somewhere that is defined by its disconnection, which seems like the inverse of how any other place might be defined.