Vasili Vasilyevich Pronchishchev (Russian: Василий Васильевич Прончищев) (1702–9 September [O.S. 29 August] 1736) was a Russian explorer.
In 1718, Vasili Pronchishchev graduated from Moscow School of Mathematics and Navigation and was promoted to naval cadet. In 1733, he was promoted to the rank of lieutenant and appointed head of one of the units of the Second Kamchatka Expedition, the purpose of which was to map the shores of the Arctic Ocean from the mouth of the Lena to the mouth of the Yenisey. In 1735, Vasili Pronchishchev went down the Lena River (from Yakutsk) on his sloop Yakutsk, doubled its delta, and stopped for wintering at the mouth of the Olenek River. Unfortunately many members of the crew fell ill and died, mainly owing to scurvy. Despite the difficulties, in 1736, he reached the eastern shore of the Taymyr Peninsula and went north along its coastline. Finally Pronchishchev and his wife Maria (also referred to as Tatyana Feodorovna) succumbed to scurvy and died on the way back. Despite the death toll, the expedition was successful regarding the fulfillment of its goals. During his journey, Vasili Pronchishchev discovered a number of islands off the northeastern coast of the Taymyr Peninsula (Faddey Islands, Komsomolskoy Pravdy Islands, Saint Peter Islands). His expedition was the first to accurately map the Lena River from Yakutsk to its estuary and the Laptev seacoast from the Lena's mouth to the Gulf of Faddey. Pronchishchev's wife Maria Pronchishcheva (died September 12(23), 1736), who took part in his expedition, is considered the first female polar explorer. After their deaths, both of them were interred at the mouth of the Olenek River. A part of the eastern coastline of the Taymyr Peninsula and a ridge between the mouths of the Olenek and Anabar Rivers bear Vasili Pronchishchev's name. Icebreaker Vasili Pronchishchev, built in 1961 in Leningrad, was also named after this pioneering Arctic explorer. Maria Pronchishcheva Bay in the Laptev Sea is named after his wife Maria.
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