SIBERIA, or Asiatic Russia, comprises all the north of Asia, extending from the Arctic ocean on the north to the Altai chain of mountains on the south, and from the Ural mountains on the west to the Pacific ocean on the east. Behring's strait on the northeast divides it from the continent of North America. Its length from west to east can not be less than four thousand miles, and its breadth from north to south varies from one to two thousand miles, the whole comprising an area of about three millions, eight hundred and twenty thousand square miles.
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Sears, Robert. An Illustrated Description of the Russian Empire. New York: Robert Sears, 1855