Getting your head around the Russian Empire can be a hard thing to grasp, so many countries one minute there in the next there out. Anyway using the internet I have managed to compile a list of some useful maps to take a look at, hopefully it will give you a more comprehensive overview of what the Empire looked like. Take a good look at #2, it has some really useful information.

#1 First here is the Russian Empire in 1866 (World Flat map)

 #2 Now this is the more comprehensive one, it contains so much information with the dates land was acquired, sold it's colour coded, annotated the works. It’s a must look, for anyone studying the Russian empire. Unfortunately it has a copyright on it so I can’t display on the site but here is the link.

https://qed.princeton.edu/images/e/ea/The_Territorial_Expansion_of_the_Russian_Empire_1795-1914.jpg

 #3 Here is a political World map of today’s world for comparison