05. Drainage
Explanation:
Dihang In the plains of Arunachal Pradesh, River Brahmaputra is known as Dihang. The Brahmaputra is one of the major rivers of Asia, it is the ninth largest river in the world by discharge, and the 15th longest. The Brahmaputra enters India in the state of Arunachal Pradesh, where it is called Siang. It appears in the plains, where it is called Dihang.