Between 1922 and 1929, Podunavlje Oblast was one of the administrative units of the Kingdom of Serbs, Croats and Slovenes. It included parts of Šumadija and Banat regions and its seat was in Smederevo. Between 1929 and 1941, one of the provinces of the Kingdom of Yugoslavia was known as the Danube Banovina. The province consisted of the geographical regions of Syrmia, Bačka, Banat, Baranya, Šumadija, and Braničevo. The capital city of the Danube Banovina was Novi Sad. In 1941, the World War II Axis Powers occupied the province. Bačka and Baranya regions were attached to Miklós Horthy's Hungary, while Syrmia was attached to the Independent State of Croatia. The remaining rump Danube Banovina (including Banat, Šumadija, and Braničevo) existed as part of German-occupied Serbia until the end of 1941 with its capital at Smederevo. Today, Smederevo is seat of the Podunavlje District of Serbia.