when you go to note 29 in this Wikipedia, it will lead you to this this map of all the claimed micronations on the Croatian-Serbian border.
Apparently, the Principality of Celestina and the Kingdom of Enclava claim pocket 1 - on Google Maps however, it is marked as Foundland-Panagua which links you to the website of the "government" of Foundland; Republic of Liberland claims Siga Island; Principality of Ongal claims Rid, Gorno Podunavie (or pocket 2) and Dolno Podunavie (or pocket 3).
Apparently, the Principality of Celestina and the Kingdom of Enclava claim pocket 1 - on Google Maps however, it is marked as Foundland-Panagua which links you to the website of the "government" of Foundland; Republic of Liberland claims Siga Island; Principality of Ongal claims Rid, Gorno Podunavie (or pocket 2) and Dolno Podunavie (or pocket 3).
Also High Seas & Outer space