The Croatia–Serbia border dispute in the Bačka and Baranja area. The Croatian claim corresponds to the red line, while the Serbian claim corresponds to the course of the Danube.     Under Serbian control, claimed by Croatia     Under de facto Croatian control, although not claimed by either Croatia or Serbia

Territorial claims in Antarctica. The area in white is unclaimed territory, or terra nullius

Terra nullius means unclaimed territory. It is the correct term in international law. It means land which does not (at present) belong to any state. The term comes from the Latin, meaning Nobody's thing. There is also an expression no man's land, but that does not have a formal legal meaning.