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What is unusual about Bir Tawil, the land between Egypt and Sudan?

Neither country claims it

Egypt and Sudan each prefer a different border line, and each line assigns Bir Tawil to the other while assigning the larger Hala'ib Triangle to itself. Claiming Bir Tawil would undermine the claim to Hala'ib.

Which is the world's newest widely recognised sovereign state?

South Sudan, from 2011

South Sudan gained independence in July 2011 after a referendum, becoming the 193rd UN member state. Kosovo declared in 2008 but is not universally recognised.

Which is the largest country in Africa by area?

Algeria

Algeria is about 2.38 million km2, having become the largest when Sudan split in 2011. Roughly 80 percent of it is Sahara.