By the Year 1800, the Russian Empire has reached the furthest corners of Siberia, and further: they have set some colonies on the Pacific shores of North America, in what is now known as Alaska and that Russia will sell to the USA in 1867. The region on the South of the Amur River has not been gained from China, which will be accomplished in 1858.
In Europe, the Baltic lands and the plains on the North shores of the Black Sea, including Crimea, have been conquered, but the Caucasus has not been reached yet. Domination of Poland and Finland were still a few decades away.
Finally, Central Asia, or Turkestan, would also be conquered later, starting in 1865.
More on the Russian Empire