Armenian Oblast ended in 1840.
Armenian Oblast was created in 1828.
The population of Armenian Oblast, a historical administrative division in the Russian Empire, was around 450,000 in the late 19th century. It is important to note that Armenian Oblast no longer exists as a political entity and is now part of modern-day Armenia.
Kamchatka Oblast ended in 2007.
Chita Oblast ended in 2008.
Kars Oblast ended in 1917.
Gharm Oblast ended in 1955.
Crimean Oblast ended in 1991.
Syr-Darya Oblast ended in 1917.
Chechen Autonomous Oblast ended in 1934.
Adyghe Autonomous Oblast ended in 1991.
Don Host Oblast ended in 1920.
Tuvan Autonomous Oblast ended in 1961.