Kazakhstan–Russia border
The Kazakhstan–Russia border is the international border between the Republic of Kazakhstan and the Russian Federation. It is the longest continuous international border in the world and the second longest by total length, after the Canada–United States border. It is in the same location as the former administrative-territorial border between the Kazakh Soviet Socialist Republic and the Russian Soviet Federative Socialist Republic.The border assumed its modern shape in 1930 and became an international border upon the dissolution of the Soviet Union in 1991. The border between Kazakhstan and Russia does not form a border between the territories populated by Kazakhs and Russians. Kazakhs, Russians and other ethnic groups live on both sides of the border.Roads and railways were not built with the border in mind and so when the border became international in 1991, one branch of the Trans-Siberian Railway, for example, was interrupted by two border crossings at Petropavl. In 2017, Russia and Kazakhstan agreed to permit transit trains without border control.Historical maps
Historical English-language maps of the Kazakh SSR-Russian SSR border from the Caspian Sea to the border with China, mid to late 20th century:
