Bir Tawil is a 2,060 km2 area of land along the border between Egypt and the Sudan, which is uninhabited and claimed by neither country. When spoken of in association with the neighbouring Hala’ib Triangle, it is sometimes referred to as the Bir Tawil Triangle, despite the area’s quadrilateral shape; the two “triangles” border at a quadripoint.
Its terra nullius status results from a discrepancy between the straight political boundary between Egypt and the Sudan established in 1899, and the irregular administrative boundary established in 1902. Egypt asserts the political boundary, and the Sudan asserts the administrative boundary, with the result that the Hala’ib Triangle is claimed by both and Bir Tawil by neither. In 2014, author Alastair Bonnett described Bir Tawil as the only place on Earth that was habitable but was not claimed by any recognised government.