Bir Tawil
The Bir Tawil area came under Egyptian administration in 1902. This was because it was grazing land of the Ababda tribe based near Aswan, Egypt. At the same time, the Hala'ib Triangle north of latitude 22° north, and northeast of the area, came under Sudanese administration. This was because the tribes of this area were based in Sudan.  The two "triangles" border at one point, a quadripoint.