hi! you may be interested in some previous posts on the topic

• Why is there no unclaimed land (Exempting Antarctica) any more and when did it become unacceptable to just have areas independent of a national entity? - Antarctica, Bir Tawil, Exclusion Zones

• When was the last time that a piece of land on Earth was not claimed by a country? - Antarctica, Bir Tawil, Serbia-Croatia border, new-born islands

• Excluding Antarctica, what was the last piece of land to be claimed by any nation? - Bir Tawil, various islands

• Has every piece of land on Earth been laid claim to by a nation? If not, when was the last piece of land claimed? - Antarctica, Bir Tawil

• Is there any land that has yet to be claimed or colonized by any country? - Spratly Islands