Consider the following tributaries of river Brahmaputra: 1. Lohit 2. Teesta 3. Subansiri 4. Sankosh
2-4-3-1
Arranging Brahmaputra River Tributaries West to East
The question asks us to arrange four tributaries of the Brahmaputra river based on their geographical location from west to east. Understanding the relative positions of these rivers is key to solving this question.
Let's look at the tributaries mentioned and their general locations where they join or flow into the Brahmaputra or its continuation (Jamuna in Bangladesh):
- Teesta: This river rises in Sikkim and flows through West Bengal before entering Bangladesh, where it joins the Brahmaputra (Jamuna) on its left bank. It is geographically located to the west of the other listed tributaries in relation to the main Brahmaputra course.
- Sankosh: This river forms part of the border between Assam and West Bengal, flowing from Bhutan. It joins the Brahmaputra in Assam. It is located east of the Teesta.
- Subansiri: Originating in the Himalayas in Tibet, this river flows through Arunachal Pradesh and Assam. It is the largest tributary of the Brahmaputra. It joins the Brahmaputra downstream of Majuli Island. It is located east of the Sankosh.
- Lohit: This river rises in eastern Tibet and flows through Arunachal Pradesh and Assam. It joins the Brahmaputra river near Sadiya, forming the main Brahmaputra. It is located to the east of the Subansiri and is often considered the easternmost significant tributary joining the main stem in India.
Based on their geographical positions from west to east, the order of these Brahmaputra river tributaries is Teesta, Sankosh, Subansiri, and Lohit.
Now let's match this order with the numbers given in the question:
- 1. Lohit
- 2. Teesta
- 3. Subansiri
- 4. Sankosh
The west-to-east order is:
| Position (West to East) | River | Number |
|---|---|---|
| 1st (West) | Teesta | 2 |
| 2nd | Sankosh | 4 |
| 3rd | Subansiri | 3 |
| 4th (East) | Lohit | 1 |
So, the correct arrangement of the rivers from west to east by their numbers is 2-4-3-1.
Revision Table: Brahmaputra Tributaries West to East
| River Name | Corresponding Number | Relative Position (West to East) |
|---|---|---|
| Teesta | 2 | Westernmost among the list |
| Sankosh | 4 | East of Teesta |
| Subansiri | 3 | East of Sankosh |
| Lohit | 1 | Easternmost among the list |
Additional Information about Brahmaputra Tributaries
The Brahmaputra river system is vast and complex, with numerous tributaries joining it from the north and the south. These tributaries contribute significantly to the volume of water in the main river and influence the regional geography and ecosystems.
- North Bank Tributaries: Important north bank tributaries (flowing from the Himalayas) include Subansiri, Kameng, Manas, Sankosh, and Teesta. These rivers are often characterized by high sediment loads and flashy flows.
- South Bank Tributaries: Important south bank tributaries (flowing from the hills and plateau regions to the south) include Lohit, Dibang, Burhi Dihing, Disang, Dikhow, Kapili, and Dhansiri.
- The Brahmaputra itself is known by different names in different regions: Yarlung Tsangpo in Tibet, Siang in Arunachal Pradesh, and Jamuna in Bangladesh.
- Understanding the location of these tributaries is important for studying the geography, hydrology, and riverine environment of the Brahmaputra basin.
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