This map is big eye porn (in good meaning)! but I spot minor flaws. the Kars region you colored as annexed territory by Russian Empire is not really correct. in 1878 Russia also acquired Batum/Batumi or also Adjara with Kars region. it will be more accurate to paint Batumi as acquired territory with Kars.

Worth mentioning that you can also add cities such as Kutaisi, Yerevan, Novorossiysk and Batumi on map due they were one of the important cities in industrial, trade, coastal port and governorate terms.



Also another reaaaly minor flaw which can be spotted by detail lurking cartographers such like me is that Russia annexed bit more coast from Ottoman Empire. somewhere till city Hopa (you can google it).