The only other place, that is actually colonizable is Bir Tawil, but the land there is so terrible, but so terrible, that noone actually made a serious attempt (a bunch of people made bogus claims, for example one guy proclaimed himself king, just so his daughter could be a princess).
Even for desert standards, Bir Tawil is desolate, and it has no decent natural resources, so literally noone wants it.
Even for desert standards, Bir Tawil is desolate, and it has no decent natural resources, so literally noone wants it.