Who owns Bir Tawil?

Bir Tawil (lit. 'tall water well') is a 2,060 km² (795.4 sq mi) area of land along the border between Egypt and Sudan, which is uninhabited and claimed by neither country. When spoken of in association with the neighbouring Halaib Triangle, it is sometimes referred to as the Bir Tawil Triangle, despite the area's quadrilateral shape; the two regions border at a quadripoint.