* Siberia: Siberia is a vast region in northern Asia that makes up over 75% of Russia's land area. It is mostly covered by forests and tundra, and is very sparsely populated. The population density is less than one person per square kilometer in many areas.
* The Russian Far East: The Russian Far East is a region in eastern Russia that borders the Pacific Ocean. It is also very sparsely populated, with a population density of less than one person per square kilometer in many areas.
* The Arctic: The Arctic is the northernmost region of Russia. It is covered by ice and snow for much of the year, and is very difficult to live in. The population density is less than one person per square kilometer in most areas.
In total, over 80% of Russia's land area is uninhabited. This is due to a number of factors, including the country's harsh climate, its large size, and its history of political and economic instability.