P.N. Savitsky (1895-1968) was a Russian pioneer of the so-called "structural geography", because of its links with the Prague linguistic circle. He was the first to propose, during and after World War I, a geopolitical vision of "Eurasia", an entity which, according to its advocates, is neither Europe nor Asia, but the "place of development" of the Russian Empire and the USSR, successor of the Mongol Empire. The "Eurasia" trend finds its origin in the Russian cultural tradition, which provides it an interpretation of evolution with "internal laws" and "external influences" establishing a natural link between language, culture and Landschaft of peoples, considered as living organisms. The second origin is an original usage of the geographical method of his time. It consists of underlining the definition of "cores" to build up "structures", delimited by the overlapping of natural or human isolines.