Austria-Hungary was a union between the Austrian Empire and the Kingdom of Hungary. A third component was Croatia-Slavonia. From 1878 Empire jointly ruled Bosnia-Herzegovina, which it joined in 1908. This great power existed in the heart of Europe from 1867 to 1918.

Wikivoyage has a travel guide for Austro-Hungarian Empire. Wikimedia Commons has media related to Austria-Hungary. Articles relating to Austria–Hungary at the International Encyclopedia of the First World War.

At first, the victorious states did not expect any change in the Austro-Hungarian border. In March 1919, the new borders of Hungary were established in Paris, but no modification was made to the border between Austria and Hungary.

This traditional border between the two halves of the Austro-Hungarian Empire was reaffirmed by the Austro-Hungarian Compromise of 1867; the border was consequently considered an administrative internal border. Stricter border controls were introduced during World War I (partly because of the war economy and the flourishing contraband trade ).