Most of the plain was located within the Hungarian part of Austria-Hungary, since all other Habsburg possessions in the plain were integrated into the Kingdom of Hungary until 1882. The autonomous Kingdom of Croatia-Slavonia, which was one of the Lands of the Crown of St. Stephen, comprised the south-western portion of the plain. With the dissolution of Austria-Hungary after World War I, the region was divided between Hungary, Romania, Czechoslovakia, Austria and the Kingdom of Serbs, Croats and Slovenes (renamed to Yugoslavia in 1929). The borders drawn in 1918 and 1919 are mostly preserved as those of the contemporary states of Austria, Czech Republic, Hungary, Poland, Slovakia, Serbia, Ukraine, Croatia, and Romania. Major cities This is a list of cities in the Pannonian Basin with a population larger than 100,000 within the city proper: Budapest Hungary (1,750,268) Belgrade Serbia (1,166,763) Zagreb Croatia (812,635) Bratislava Slovakia (546,300) Timișoara Romania (319,279 ) Novi Sad Serbia (277,522) Košice Slovakia (240,688) Debrecen Hungary (204,333) Oradea Romania (196,367) Miskolc Hungary (162,905) Szeged Hungary (161,837) Arad Romania (159,704) Pécs Hungary (147,719) Győr Hungary (128,567) Nyíregyháza Hungary (118,185) Uzhhorod Ukraine (115,163) Kecskemét Hungary (111,863) Osijek Croatia (108,048) Subotica Serbia (105,681) Satu Mare Romania (102,441) See also Geography of Europe Central Europe Pannonian Biogeographic Region Pannonian Sea Transdanubian Mountains Pelso unit Tisza unit References External links Zentai László's account of the Basin formation In Hungarian. Anthropological sketch of the prehistoric population Körös Regional Archaeological Project: Neolithic and Copper Age archaeology in the Pannonian plain Aulacogens Basins of Europe Structural basins Sedimentary basins of Europe Back-arc basins Geology of Austria Geology of Bosnia and Herzegovina Geology of Croatia Geology of the Czech Republic Geology of Europe Geology of Hungary Geology of Poland Geology of Romania Geology of Serbia Geology of Slovakia Structural basins of Slovenia Geology of Ukraine Landforms of Lower Austria Landforms of Bosnia and Herzegovina Landforms of Croatia Landforms of the Czech Republic Landforms of Slovenia Plains of Europe Plains of Austria Plains of Hungary Plains of Romania Plains of Serbia Plains of Slovakia Plains of Ukraine Geography of Vojvodina Banat Bačka Syrmia Pannonia