Bir Tawil is a strip of land between Egypt and Sudan that is not claimed by either country. It covers an area of 2,060 square kilometers and has a quadrilateral shape. It exists because of a border misunderstanding. In 1899, when they still had power over the area, the United Kingdom set the border between Sudan and Egypt at the 22nd parallel. However, in 1902, they set a different administrative boundary, which placed a triangle of land above the 22nd parallel under Sudanese control.
Egypt claims the original border of 1899 while Sudan claims the one from 1902. As such, Bir Tawil technically belongs to neither of them because there is not basis in international law for either to claim it. And it would be nearly impossible for a third state to claim it as the only way to the land is through Egypt or Sudan. Bir Tawil, therefore, is one of only a few land areas not claimed by a country.