The Cossack Simon Dezhneff is thought to have made a voyage, in the summer of 1648, from the river Kolyma, through Bering Strait (which was rediscovered by Vitus Bering in 1728) to Anadyr.
In the season of 1740 he continued his voyage to beyond the Kolyma, wintering at Nizhni Kolymsk.
'The three rivers of 'north-eastern Siberia - the Yana, Indigirka and Kolyma - have the same general character, their courses.
The bays of the Kolyma, the Chaun and Kolyuchin are of little importance.
Even the mouths of the Ob, Yenisei, Lena and Kolyma in 70° N.
In the same year in which Khabarov explored the Amur (1648) the Cossack Dejnev, starting from the Kolyma, sailed round the north-eastern extremity of Asia through the strait which was rediscovered and described eighty years later by Bering (1728).
Isai Ignatiev made a voyage eastward from the Kolyma river in 1646, and Simon Dezhnev in 1648 followed his route and prolonged it, rounding the East or Dezhnev Cape, and entering the strait.