Bir Tawil
Egypt claims the original border from 1899, the 22° north circle of latitude. This would place the Hala'ib Triangle within Egypt and the Bir Tawil area within Sudan. Sudan claims the administrative border of 1902. This would put Hala'ib within Sudan, and Bir Tawil within Egypt. As a result, both states claim the Hala'ib Triangle. Neither state claims the much less valuable Bir Tawil area, which is only a tenth the size and is landlocked.  There is no basis in international law for Sudan or Egypt to claim both territories. It would also be difficult for any other state to claim the area. This is because only Sudan or Egypt border the land. As a result, Bir Tawil is one of the few land areas of the world which is not claimed by any state. The offical currency is the Sahrawi peseta but this is no longer circulated.