Explanation: The geography of Bangladesh is significantly influenced by its river systems, particularly the confluence of major rivers. The Brahmaputra River, originating in Tibet and flowing through India, joins the Ganga River in Bangladesh. The Ganga, also known as the Padma in Bangladesh, is a major river that originates in the Himalayas and flows through India before entering Bangladesh. When the Brahmaputra and Ganga meet, they form the Padma River, which is a significant waterway in Bangladesh.
However, the Padma River is not the final river that flows into the Bay of Bengal. The Padma River further merges with the Meghna River, which is formed by the confluence of several rivers including the Surma and Kusiyara. The Meghna River, after merging with the Padma, becomes the final river system that flows into the Bay of Bengal. This confluence of rivers creates a vast deltaic region, known as the Sundarbans, which is one of the largest mangrove forests in the world.
Understanding the river systems in Bangladesh is crucial for comprehending the country's geography, hydrology, and environmental issues. The Meghna River, being the final river that flows into the Bay of Bengal, plays a significant role in the region's ecology, agriculture, and transportation. It is important to note the sequence of river confluences and the final river system to avoid common misconceptions about the river systems in Bangladesh.
In summary, the Meghna River is the correct answer as it is the final river that flows into the Bay of Bengal after the confluence of the Brahmaputra and Ganga rivers in Bangladesh. This understanding is essential for students studying the geography and river systems of Bangladesh.