[rmc]

Fun fact, there's a patch of 20,000 km² of desert between Egypt and Sudan that neither country claims. ( http://en.wikipedia.org/wiki/Halaib_Triangle ). It's essentially no-man's land, but for countries.

[dubfan]

The territory you're referring to is called Bir Tawil: http://en.wikipedia.org/wiki/Bir_Tawil

[rmc]

Oops, yes got them mixed up, thanks.