Explanations:The Mahananda River is a significant tributary of the Ganga River, originating from the Nepal-Sikkim border and flowing through the Indian states of West Bengal and Bihar before joining the Ganga in Bangladesh. This river is an important geographical feature in the region, contributing to the hydrological system of the Ganga basin.
The Mahananda River is approximately 360 kilometers long and is known for its scenic beauty and ecological importance. It flows through the Darjeeling district of West Bengal and the Muzaffarpur district of Bihar before reaching Bangladesh. The river is fed by several smaller streams and tributaries, which contribute to its flow and make it a vital water resource for the region.
Understanding the geographical context of the Mahananda River is crucial for comprehending the broader hydrological and ecological systems of the Ganga basin. The river's origin from the Nepal-Sikkim border and its confluence with the Ganga in Bangladesh highlights the interconnectedness of the region's water systems and the importance of transboundary water management.
Other rivers mentioned in the options, such as the Kosi, Gandak, and Gomti, are also significant tributaries of the Ganga but have different origins and confluence points. The Kosi River, for example, originates from the Himalayas in Nepal and joins the Ganga in India, while the Gandak River also originates from Nepal but joins the Ganga in India. The Gomti River, on the other hand, originates from the Gomat Taal in the Himalayas and joins the Ganga in Uttar Pradesh, India.
Thus, the Mahananda River stands out as the correct answer due to its unique geographical characteristics and its role in the Ganga basin's hydrological system.