Final answer:
The Ob River is the westernmost Siberian river flowing into the Arctic Ocean and is fed by the Katun River, a tributary of the Irtysh River. It is the 7th longest river in the world and plays a crucial role in the Siberian landscape. Other major rivers in the region include the Yenisey, Lena, Amu Darya, and the longest European river, the Volga.
Step-by-step explanation:
The westernmost of the three great Siberian rivers that flows into the Arctic Ocean and is the 7th longest river in the world is the Ob River. The Ob River is sourced from the Katun River, which originates in the Altai Mountains and is a tributary of the Irtysh River.
Along with the Yenisey and Lena Rivers, the Ob River is one of the primary waterways that shape the Siberian landscape. Importantly, these rivers flow north through Siberia into the Arctic Ocean. The Irtysh River itself is a major river system and, along with other rivers like the Amu Darya and Volga, it plays a vital role in the regional geography and ecosystem of Russia and adjoining areas.
Rivers are essential for transportation, fresh water, and ecological habitats. In Russia, the Volga River is notably the longest in Europe, providing a crucial link for cities and industries along its banks. Beyond the local importance, rivers often have significant environmental and geopolitical roles, as seen with the Amu Darya's impact on the Aral Sea and the demarcation of political boundaries like the Amur River between Russia and China.