Matvej Matvejevitsj Gedensjtrom (Russian: Матвей Матвеевич Геденштром) (± 1780 - Tomsk, September 20, 1845) was a Russian pole investigator. From 1808 to 1810 he, together with Jakov Sannikov, led an expedition to the New Siberian Islands to map it. During this expedition two scientific theories were created, which are now out of date. Both Sannikov and Gedensjtrom reported on returning to discover a undiscovered country north of Siberia. This so-called Sannikovland, whose existence was confirmed by two later expeditions led by Eduard Toll, did not appear to exist at subsequent tours.
Gedensjtrom also established the presence of Polinia's (large ice-free wake on the boundary of the ice-cream and ice-cream connected with the mainland), which suggested that it would be possible to reach the North Pole via an ice-free zone. With this he formed one of the founders of the theory of the ice-free Northern Iceland Sea with regard to Northeastern Transport, as Gedensjtrom suspected that access to this ice-free zone could be somewhere between the Canadian Arctic Islands.
At later expeditions, Gedensjtrom maped the area between the Jana and the Kolyma estuaries. He also made many trips through Jakarta and through the Transbaikal.
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