The Imperiia Project: a spatial history of the Russian Empire

Sheets and scales

Ob' River (3,649 km): 14 sheets, or 287 km per sheet
Tobol' River (1,591 km): 9 sheets, or 177 km per sheet
Lena River (4,400 km): 5 sheets, or 880 km per sheet
Amur River (4,444 km): 3 sheets, or 1,481 km per sheet
 

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