Колыма
In 1648 Semyon Dezhnev sailed from the mouth of the Kolyma River through the Arctic Ocean and around the eastern tip of Asia to the Anadyr River. One legend holds that some of his boats were carried off course and reached Alaska. However, no evidence of settlement survives. Dezhnev's discovery was never forwarded to the central government, leaving open the question of whether or not Siberia was connected to North America.