Final answer:
The Ganges and the Brahmaputra are the two rivers at the bottom of the Himalayan mountains that join together in Bangladesh to then flow into the Bay of Bengal.
Step-by-step explanation:
The two rivers that are located at the bottom of the Himalayan mountains are the Ganges and the Brahmaputra. The Ganges River is one of India's most important rivers, which flows from the Himalayas through northern India and into Bangladesh. Hindus regard the Ganges as a sacred river. It travels across northern India before joining with the Brahmaputra in Bangladesh, and together they empty into the Bay of Bengal, which is a bay located north of the Indian Ocean, on the eastern side of India, south of Tibet, and west of China.
On the other hand, the Brahmaputra River begins in Tibet, flows through northeast India, and into Bangladesh, where it is known as the Jamuna River. This river provides a crucial waterway for the region and is one of the rivers contributing to the immense flow of water through Bangladesh. Finally, it merges with the Ganges and empties into the Bay of Bengal.