From what I have stated above it follows that the coast population of North Russia earned on an active navigation on the Polar Sea long before the English and the Dutch, and that commercial expeditions were often undertaken from the White Sea and the Petchora to the Ob and the Yenisej, sometimes wholly by sea round Yalmal, but most frequently partly by sea and partly by land transport over that peninsula. In the latter case the Russians went to work in the following way; they first sailed through Yugor Straits, and over the southern part of the Kara Sea to the mouth of the Mutnaja, a river debouching on Yalmal; they then rowed or towed the boats up the river and over two lakes to a ridge about 350 metres broad, which forms the watershed on Yalmal between the rivers running west and those running east; over this ridge the boats and the goods were dragged to another lake, Selennoe, from which they were finally carried down the River Selennaja to the Gulf of Obi.[159] These and similar accounts were collected with great difficulty, and not without danger, by the Muscovy Company's envoys; but among the accounts that have been thus preserved we do not find a single sketch of any special voyage, on the ground of which we could place a Russian name beside that of Willoughby, Burrough, Pet and Barents in the older history of the North-East Passage. The historical sources of Russia too must be similarly incomplete in this respect, to judge from the otherwise instructive historical introduction to Luetke's voyage. Gallant seamen, but no Hakluyt, were born during the sixteenth and seventeenth century on the shores of the White Sea, and therefore the names of these seamen and the story of their voyages have long since fallen into complete obscurity, excepting some in comparatively recent times. In the second edition of Witsen's great work we find, at page 913, an account of an unsuccessful hunting voyage to the Kara Sea, undertaken in 1690, that is to say, at a time when voyages between the White Sea and the Obi and Yenisej were on the point of ceasing completely. The account was drawn up by Witsen from an oral communication by one of the shipwrecked men, Rodivan Ivanov, who was for several years mate on a Russian vessel, employed in seal-fishing on the coast of Novaya Zemlya and Vaygats Island.