Siberia is 0.52 times as big as United States
Siberia is an extensive geographical region spanning much of Eurasia and Northern Asia. Siberia stretches southwards from the Arctic Ocean to the hills of north-central Kazakhstan and to the national borders of Mongolia and China. With an area of 13.1 million square kilometres (5,100,000 sq mi), Siberia accounts for 77% of Russia's land area, but it is home to only 23% of the country's population (approximately 33 million people). If it were a country by itself, it would still be the largest country by area, but in population it would be the world's 35th-largest and Asia's 14th-largest.
The United States of America (USA), commonly known as the United States (U.S. or US) or America, is a country located primarily in North America, consisting of 50 states, a federal district, five major self-governing territories, and various possessions. At 3.8 million square miles (9.8 million square kilometers), it is the world's third- or fourth-largest country by total area.