The British Empire and other colonial powers did a lot of things wrong, and they famously ignored actual human patterns when drawing borders of Africa. In 1899, the British drew a border between Egypt and Sudan that simply ran in a straight line across the 22nd parallel, ignoring how people in the area moved and identified. A few years later, in 1902, they corrected their mistake and re-drew the boundary.
The result has led to a border dispute between Egypt and Sudan where Egypt claims the 1899 border, and Sudan the 1902 border. This dispute means that a small patch of desert, Bir Tawil, is not claimed by either nation. In 2014 a man from the United States attempted to claim the land and declare it to be the Kingdom of North Sudan. Why? So his daughter could be a princess, of course.
The image below shows Bir Tawil on Google Maps, with the pin in its location. Next to it is the Hala’ib Triangle, which both countries claim.
An opinion piece about Jerimiah Heaton and his micronation over at the the Independent. The author points out, with cause, how bad it looks for a white westerner to suddenly be claiming to own a chunk of Africa.