Manas
The river flows in Bhutan and is a tributary of Sankosh river. Sankosh River is itself a tributary of Brahmaputra
The Brahmaputra, also called Tsangpo-Brahmaputra
Tributary - flows into Distributary - flows out of
A Tributary
1. Tributary.
Ganges-Brahmaputra. The Ganges river flows through India and exits out of Bangladesh The Brahmaputra river begins in China, flows through northeastern India, and exits through Bangladesh.
A tributary.
Asia. From its origin in southwestern Tibet as the 'Yarlung Zangbo River', it flows across southern Tibet to break through the Himalayas in gorges and into Arunachal Pradesh where it is known as 'Dihang'. It flows southwest through the Assam Valley as 'Brahmaputra' and south through Bangladesh as the Jamuna. There it merges with the Ganges to form a vast delta
Blue Nile from Lake Tana in Ethiopia.
Because a tributary flows into a river. If a tributary flowed directly into the sea - it would be a river - not a tributary !
The term is tributary. It means that it contributes to the bigger stream.
The Brahmaputra is a major river in Asia. It begins in Tibet in the Himalayas and passes through Bangladesh and India and then flows into the Bay of Bengal. It travels about 1800 miles.