The Treaty of Kars was a treaty that established the borders between Turkey and the three Transcaucasian Soviet republics, which are now the independent republics of Armenia, Georgia and Azerbaijan. The treaty was signed in the city of Kars on 13 October 1921.

Azerbaijan, officially the Republic of Azerbaijan, is a transcontinental country located at the boundary of Eastern Europe and West Asia. It is a part of the South Caucasus region and is bounded by the Caspian Sea to the east, Russia's republic of Dagestan to the north, Georgia to the northwest, Armenia and Turkey to the west, and Iran to the south. Baku is the capital and largest city.