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Pyotr Petrovich Semenov-Tyan-Shansky was a Russian geographer and statistician who managed the Russian Geographical Society for more than 40 years.
Pyotr Semenov was born into a noble family and studied at Saint Petersburg University. Together with Fyodor Dostoyevsky, Semenov attended secret meetings of the "Petrashevsky Circle". During the 1850s he studied geography and geology in Berlin under Alexander Humboldt and Carl Ritter, whose writings he translated into Russian.
On Humboldt's suggestion, Semenov determined to explore the largely unknown mountains of the Tian Shan. In 1856, he set off from Barnaul on his first expedition, passing through the Altay Mountains and visiting Lake Issyk Kul on his way. In 1857, he returned to the Tian Shan, exploring the interior of this hitherto unknown mountain range. Semenov was the first European to see the scenic panorama of the Tengri Tag, and its most beautiful peak, the colossal Khan Tengri.
One of his most interesting discoveries was to disprove Humboldt's earlier claims about Tian Shan's supposed volcanic origins. Semenov found no evidence of volcanic activity anywhere in the mountains. The next year, he published the first systematic description of the Tian Shan. The reputation of this monograph was such that half a century later Nicholas II of Russia authorized him to add the epithet "Tian-Shansky" to his last name.
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