Russia in Europe and Asia
Ethnic map of European Russian Empire prior to the outbreak of the First World War
European Russia (also Western Russia or Central Russia) refers to the Western areas of Russia that lie within Europe, comprising roughly 3,960,000 square kilometres (1,528,560 mi2) and spanning across 40% of Europe. Its Eastern border is defined by the Ural Mountains and in the South it is defined by the border with Kazakhstan. This area includes Moscow and St. Petersburg, the two largest cities of Russia.
Roughly 77% of the entire Russian population (about 110,000,000 people out of an approximate total Russian population of 141,000,000) lives in Western Russia, at an average of 27 persons per km2 (69.9 per mi2).:6:10 Even though 75% of Russia's territory lies within Asia, the Asian part of Russia accommodates only 22% of its population at 2.5 persons per km2 (6.5 per mi2).:6
The term "European Russia" was used in the Russian Empire to refer to traditional East Slavic territories under Russian control, including what is now Belarus and most of Ukraine (Dnieper Ukraine).