Final answer:
Russia spans Europe and Asia, with most of its population residing in the European part on the Eastern European Plain, delineated by the Ural Mountains. This area boasts more temperate climates and productive land, contributing to its greater population density.
Step-by-step explanation:
Russia spans two continents: Europe and Asia. The Ural Mountains provide a natural divide between European and Asian Russia. Despite its larger Asian territory, most Russians live in the European part of the country, primarily on the Eastern European Plain or the Russian Plain. This area is not only the most agriculturally productive land in Russia, but it also harbors a majority of the nation's population due to the more temperate climate and fertile soils compared to the harsher climates of Siberia and the Russian Far East.
The main reasons for the population distribution include the concentration of economic and political activities, such as those in the major city of Moscow, and historic settlements and development patterns. Transportation links, like the Trans-Siberian Railway which connects Moscow with the Far East, have significantly contributed to the development and integration of these regions throughout Russian history.