Question

About Ob-yensei lowland

Answer 1

Ob River, river of central Russia. One of the greatest rivers of Asia, the Ob flows north and west across western Siberia in a twisting diagonal from its sources in the Altai Mountains to its outlet through the Gulf of Ob into the Kara Sea of the Arctic Ocean. It is a major transportation artery, crossing territory at the heart of Russia that is extraordinarily varied in its physical environment and population. Even allowing for the barrenness of much of the region surrounding the lower course of the river and the ice-clogged waters into which it discharges, the Ob drains a region of great economic potential.it have a  course of 2,268 miles (3,650 km). If, however, the Irtysh River is regarded as part of the main course rather than as the Ob’s major tributary, the maximum length, from the source of the Black (Chorny) Irtysh in China’s sector of the Altai, is 3,362 miles (5,410 km), making the Ob the seventh longest river in the world. The catchment area is approximately 1,150,000 square miles (2,975,000 square km). Constituting about half of the drainage basin of the Kara Sea, the Ob’s catchment area is the sixth largest in the world.Physical FeaturesPhysiographyThe West Siberian Plain covers about 85 percent of the Ob basin. The rest of the basin comprises the terraced plains of Turgay (Kazakhstan) and the small hills of northernmost Kazakhstan in the south and the Kuznetsk Alatau range, the Salair Ridge, the Altai Mountains and their foothills and outliers in the southeast.There are more than 1,900 rivers within the basin, with an aggregate length of about 112,000 miles (180,000 km). The Irtysh, a left-bank tributary 2,640 miles (4,250 km) long, itself drains about 615,000 square miles (1,593,000 square km; a somewhat larger area than that drained by the upper and middle Ob above the Irtysh confluence); and some 70 percent of the whole basin is drained by left-bank tributaries.The huge basin of the Ob stretches across a number of natural zones. Semidesert prevails in the far south around Lake Zaysan (recipient of the Black Irtysh and source of the Irtysh proper), bordered on the north by steppe grassland. The central regions of the West Siberian Plain—i.e., more than half of the basin—consist of taiga (swampy coniferous forest), with great expanses of marshland. In the north there are vast stretches of tundra (low-lying, cold-tolerant vegetation).The upper Ob runs from the junction of the Biya and Katun to the confluence of the Tom River, the middle Ob from the junction with the Tom to the Irtysh confluence, and the lower Ob from the junction with the Irtysh to the Gulf of Ob.