Ilya Perfilyev ( Perfiryev ) ( Russian : Илья Перфильев (Перфирьев) ) (1583?1659), was a Russian explorer, polar seafarer and a founder of Verkhoyansk . In the summer of 1633 he headed a group, consisted of merchant-and-industrial people and Yenisey and Tobolsk Cossacks . In 1634 he discovered the Yana River and the Yana-Indigirka Lowland .
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