<P> Yenisey and Lena Basins: Yeniseysk is on the Yenisei River just north of its juncture with the Angara River . From Yeniseysk east up the Angara to the Ilim River, upstream to Ilimsk (1630), portage to Kuta River, short trip downstream to Ust - Kut (1631) on the Lena River . From here northeast down the Lena about 1400 km to Yakutsk, which is 4900 km east of Moscow . Yakutsk is a major stopping point and administrative center . Then 125 km down the Lena to the Aldan, up the Aldan River to Ust - Maya, then up the Maya River or its right branch, the Yudoma River . </P> <P> Okhotsk: From either of the last two, it is about 150 km over 2000 ft mountains to the Pacific (Okhotsk Coast 1639, Okhotsk town, 1647). Pack horses were used here . Okhotsk is 800 km east southeast of Yakutsk and 5,600 km east of Moscow . After 1715 there were shipbuilding facilities at Okhotsk, allowing sea travel to the Kamchatka Peninsula, the Kuril Islands, the Aleutian Islands and Alaska . </P> <P> To the Amur: From 1643 to 1689 the Russians attempted to penetrate from the Lena south to the Amur region but were driven back by the Manchus . See Russian - Manchu border conflicts . From 1689 to 1859 the Russo - Chinese border was the Argun River and the Stanovoy Mountains . In 1859 Russia annexed the Amur region . From the west, the Russians penetrated to Ulan - Ude (1666), Chita (1653) and Nerchinsk (1654) toward the Argun . From 1727 much Russo - Chinese trade shifted to Kyakhta near where the Selenge River crosses the current Russo - Mongol border . </P> <P> From at least the 12th century, Russian Pomors navigated the White and Barents Seas . At some date, they entered the Ob Gulf or portaged across the Yamal Peninsula . From the Gulf of Ob to the Taz Estuary, up the Taz River, past Mangazeya (1601), portage to Yanov Stan on the Turukhan River, leading to Turukhansk (1607) on the Yenisei at its juncture with the Lower Tunguska . East up the Lower Tunguska . Where it turns south, portage to the Chona River, a tributary of the Vilyuy River - the junction of these two rivers has now been flooded, forming the Viluyskoe Reservoir . East along the Vilyuy to the Lena River, and then up the Lena to Yakutsk . It was also possible to continue up the Lower Tunguska to near Kirensk (1630) (175 km northeast of Ust - Kut), make a short portage to the Lena, and down the Lena to Yakutsk . Yakutsk is about 2400 km from the Taz Estuary . After about 1700 most trade shifted south and the route west of Turukhansk was largely abandoned . </P>

What siberian river flows into the bering sea