Explanation:

The Barak is a 2,000 km river flowing through the states of Nagaland, Manipur, Mizoram and Assam in India, Thailand and into the Bay of Bengal via Bangladesh. It is being developed as one of the Inland waterways of India

The Lohit River or Zayü River is a river in India and China. It is a tributary to the Brahmaputra River. It descends through this mountainous region and surges through Arunachal Pradesh in India for 200 kilometres (120 mi) before entering the plains of Assam where it is known as the Lohit River. 

The Subansiri River is a tributary of the Brahmaputra River in the Indian states of Assam and Arunachal Pradesh, and the Tibet Autonomous Region of China.