This 1825 map of Omsk Province is from a larger work, Geograficheskii atlas Rossiiskoi imperii, tsarstva Pol'skogo i velikogo kniazhestva Finliandskogo (Geographical atlas of the Russian Empire, the Kingdom of Poland, and the Grand Duchy of Finland), containing 60 maps of the Russian Empire. Compiled and engraved by Colonel V.P. Piadyshev, it reflects the detailed mapping carried out by Russian military cartographers in the first quarter of the 19th century. The map shows population centers (five gradations by size), postal stations, roads (three types), borders with foreign lands, provincial and district borders, forts, outposts, redoubts, mines, and mosques. Distances are shown in versts, a Russian measure, now no longer used, equal to 1.07 kilometers. Legends and place-names are in Russian and French. Omsk was founded in the early 18th century as a fortress to protect Russian settlements against nomadic peoples of the steppe. Two of the largest rivers in Siberia, the Ob and the Irtysh Rivers, flow through the region. The fur trade was at this time the mainstay of the local economy.