The Barak River System (covering the Barak valley \u2014 the southern region of Assam including Cachar, Hailakandi, and Karimganj districts)<\/li>\n<\/ul>\n\n\n\nKey Fact for Exams: <\/strong>Assam has more than 50 rivers. The Brahmaputra, along with its numerous north-bank and south-bank tributaries, forms one of the largest river systems in Asia. The rivers originate from Tibet, Bhutan, Arunachal Pradesh, Nagaland, Manipur, and Meghalaya.<\/p>\n\n\n\n<\/span>1. The Brahmaputra River \u2014 The Mighty Luit<\/span><\/h1>\n\n\n\n<\/span>Origin and Journey<\/span><\/h2>\n\n\n\nThe Brahmaputra originates from the Chemayungdung glacier near the Kailash Range in Tibet, at an altitude of approximately 5,300 metres above sea level. It is known by different names in different regions<\/p>\n\n\n\nRegion<\/strong><\/td>Local Name<\/strong><\/td>Country\/State<\/strong><\/td>Meaning<\/strong><\/td><\/tr><\/thead>Tibet<\/td> Yarlung Tsangpo \/ Tsangpo<\/td> China (Tibet)<\/td> Purifier from heaven<\/td><\/tr> Arunachal Pradesh<\/td> Siang \/ Dihang<\/td> India<\/td> \u2014<\/td><\/tr> Assam<\/td> Brahmaputra \/ Luit<\/td> India<\/td> Son of Brahma \/ Red River<\/td><\/tr> Bangladesh<\/td> Jamuna<\/td> Bangladesh<\/td> \u2014<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<\/p>\n\n\n\n
<\/span>Key Facts about Brahmaputra<\/span><\/h2>\n\n\n\n\nTotal length: approximately 2,900 km (one of the longest rivers in the world)<\/li>\n\n\n\n Length within Assam: approximately 720 km<\/li>\n\n\n\n It flows from east to west through Assam before turning south into Bangladesh<\/li>\n\n\n\n The Brahmaputra is a trans-boundary river flowing through China, India, and Bangladesh<\/li>\n\n\n\n It is the only major river in India that has a male name<\/li>\n\n\n\n The river flows through the great Assam valley between the Himalayas to the north and the Shillong Plateau to the south<\/li>\n\n\n\n Near Guwahati, the river narrows to about 1 km at Umanda Island (Peacock Island)<\/li>\n\n\n\n Near Dibrugarh, the river can be as wide as 18 km during floods<\/li>\n<\/ul>\n\n\n\n<\/span>Major Tributaries of the Brahmaputra in Assam<\/span><\/h2>\n\n\n\n<\/span>North Bank Tributaries (from Arunachal Pradesh & Bhutan)<\/span><\/h3>\n\n\n\n\nSubansiri River \u2014 largest north-bank tributary<\/li>\n\n\n\n Jiabharali (Kameng \/ Jia Bhoreli)<\/li>\n\n\n\n Manas River \u2014 flows through Manas Tiger Reserve<\/li>\n\n\n\n Puthimari<\/li>\n\n\n\n Pagladia<\/li>\n\n\n\n Beki<\/li>\n\n\n\n Champavati<\/li>\n\n\n\n Saralbhanga<\/li>\n\n\n\n Sankosh (forms Assam-West Bengal border)<\/li>\n\n\n\n Dibang \u2014 joins near Sadiya<\/li>\n\n\n\n Lohit \u2014 joins near Sadiya<\/li>\n<\/ul>\n\n\n\n<\/span>South Bank Tributaries (from Meghalaya, Nagaland, Manipur Hills)<\/span><\/h3>\n\n\n\n\nKopili River \u2014 major south-bank tributary; Kopili Hydel Project located here<\/li>\n\n\n\n Digaru<\/li>\n\n\n\n Kulsi<\/li>\n\n\n\n Dhansiri (South) \u2014 flows from Nagaland<\/li>\n\n\n\n Dihing \/ Dehing \u2014 Dibru-Saikhowa area<\/li>\n\n\n\n Disang<\/li>\n\n\n\n Doiyang<\/li>\n\n\n\n Jhanji<\/li>\n\n\n\n Bhogdoi \u2014 flows through Jorhat<\/li>\n<\/ul>\n\n\n\n<\/span>Significance of Brahmaputra for Exams<\/span><\/h2>\n\n\n\n\nMajuli Island: world’s largest river island \u2014 located in the Brahmaputra; a major cultural and exam topic<\/li>\n\n\n\n Kaziranga National Park lies on the south bank of Brahmaputra (Golaghat & Nagaon districts)<\/li>\n\n\n\n The Brahmaputra carries one of the heaviest silt loads of any river in the world<\/li>\n\n\n\n Saraighat Bridge (Guwahati) \u2014 first railway-cum-road bridge over Brahmaputra, opened 1963<\/li>\n\n\n\n Kolia Bhomora Setu (Tezpur) and Naranarayan Setu (Jogighopa) are other important bridges<\/li>\n\n\n\n Brahmaputra causes severe annual flooding in Assam \u2014 a major environmental and policy issue<\/li>\n<\/ul>\n\n\n\n<\/span>2. The Barak River \u2014 Second Largest River System<\/span><\/h1>\n\n\n\n<\/span>Origin and Course<\/span><\/h2>\n\n\n\nThe Barak River originates from the Nagaland-Manipur border hills and flows westward through Manipur before entering Assam. It is the principal river of the Barak valley, covering the districts of Cachar, Hailakandi, and Karimganj.<\/p>\n\n\n\n
\nTotal length: approximately 564 km<\/li>\n\n\n\n Length in Assam: approximately 221 km<\/li>\n\n\n\n Enters Assam at Jiribam (Manipur border area)<\/li>\n\n\n\n At Bhanga (Bangladesh), it splits into two rivers: Surma and Kushiyara<\/li>\n\n\n\n It ultimately drains into the Bay of Bengal via the Meghna River<\/li>\n<\/ul>\n\n\n\n<\/span>Major Tributaries of Barak<\/span><\/h2>\n\n\n\n\nSonai River<\/li>\n\n\n\n Katakhal River<\/li>\n\n\n\n Jiri River<\/li>\n\n\n\n Singla River<\/li>\n\n\n\n Longai River<\/li>\n\n\n\n Madhura River<\/li>\n<\/ul>\n\n\n\nExam Tip: <\/strong>Barak valley (Cachar region) is often called the ‘Surma Valley’ in older texts. The Barak river is the lifeline of the three districts in southern Assam.<\/p>\n\n\n\n<\/span>3. Other Important Rivers of Assam (Tributaries in Detail)<\/span><\/h1>\n\n\n\n<\/span>Subansiri River<\/span><\/h2>\n\n\n\n\nOriginates in Tibet; one of the major rivers of Arunachal Pradesh before entering Assam<\/li>\n\n\n\n It is the largest north-bank tributary of Brahmaputra<\/li>\n\n\n\n Length: approximately 442 km<\/li>\n\n\n\n Flows through Subansiri district (Arunachal Pradesh) before entering Assam at Gerhelong<\/li>\n\n\n\n The Lower Subansiri Hydroelectric Project (2,000 MW) is located here \u2014 a major exam topic<\/li>\n\n\n\n Flows through Dhemaji and Lakhimpur districts in Assam<\/li>\n<\/ul>\n\n\n\n<\/span>Manas River<\/span><\/h2>\n\n\n\n\nOriginates in Bhutan (Royal Manas National Park area)<\/li>\n\n\n\n Length: approximately 376 km<\/li>\n\n\n\n Manas National Park \u2014 a UNESCO World Heritage Site and Project Tiger reserve in Assam<\/li>\n\n\n\n It is a north-bank tributary of Brahmaputra, meeting it in Barpeta district<\/li>\n\n\n\n Manas River forms the boundary between Assam and Bhutan in some stretches<\/li>\n<\/ul>\n\n\n\n<\/span>Kopili River<\/span><\/h2>\n\n\n\n\nOriginates in the Meghalaya hills (Jaintia Hills area)<\/li>\n\n\n\n It is a major south-bank tributary of Brahmaputra<\/li>\n\n\n\n Length: approximately 290 km<\/li>\n\n\n\n Kopili Hydel Project (Umrangshu) \u2014 located in Karbi Anglong, generates hydroelectric power<\/li>\n\n\n\n Flows through Karbi Anglong and Hojai (Nagaon) before joining Brahmaputra in Morigaon district<\/li>\n<\/ul>\n\n\n\n<\/span>Dhansiri River<\/span><\/h2>\n\n\n\n\nOriginates in the Nagaland hills<\/li>\n\n\n\n Length: approximately 352 km<\/li>\n\n\n\n Flows through Golaghat and Karbi Anglong districts<\/li>\n\n\n\n A south-bank tributary of Brahmaputra<\/li>\n\n\n\n Important for irrigation in the region<\/li>\n<\/ul>\n\n\n\n<\/span>Dihing (Dehing) River<\/span><\/h2>\n\n\n\n\nOriginates from the Patkai hills (Nagaland-Arunachal border)<\/li>\n\n\n\n Passes through Dibru-Saikhowa National Park<\/li>\n\n\n\n Dehing Patkai Wildlife Sanctuary lies along this river<\/li>\n\n\n\n Joins Brahmaputra near Dibrugarh area<\/li>\n\n\n\n Also known as the river of the Ahom heartland in historical texts<\/li>\n<\/ul>\n\n\n\n<\/span>Jiabharali \/ Kameng River<\/span><\/h2>\n\n\n\n\nKnown as ‘Kameng’ in Arunachal Pradesh<\/li>\n\n\n\n Enters Assam as Jiabharali in Sonitpur district<\/li>\n\n\n\n North-bank tributary of Brahmaputra<\/li>\n\n\n\n Nameri National Park lies on the banks of Jiabharali<\/li>\n<\/ul>\n\n\n\n<\/span>Dibang River<\/span><\/h2>\n\n\n\n\nOriginates in Mishmi Hills of Arunachal Pradesh<\/li>\n\n\n\n Joins Brahmaputra near Kobo (Lakhimpur district)<\/li>\n\n\n\n One of the three rivers forming the ‘tri-junction’ near Sadiya (Dibang, Lohit, Siang)<\/li>\n\n\n\n Dibang Valley district is named after this river<\/li>\n<\/ul>\n\n\n\n<\/span>Lohit River<\/span><\/h2>\n\n\n\n\nOriginates in Tibet (southeastern Tibetan plateau)<\/li>\n\n\n\n Enters India through Arunachal Pradesh<\/li>\n\n\n\n Joins Brahmaputra near Sadiya<\/li>\n\n\n\n One of the key right-bank tributaries before the formation of main Brahmaputra stream<\/li>\n\n\n\n Lohit district of Arunachal Pradesh is named after it<\/li>\n<\/ul>\n\n\n\n<\/span>4. Quick Reference Table: Major Rivers of Assam<\/span><\/h1>\n\n\n\nThe following table is designed for rapid revision before exams:<\/p>\n\n\n\nRiver<\/strong><\/td>Origin<\/strong><\/td>Enters Assam At<\/strong><\/td>Length<\/strong><\/td>Districts Covered<\/strong><\/td>Drains Into<\/strong><\/td><\/tr><\/thead>Brahmaputra<\/strong><\/td>Tibet (Chemayungdung glacier)<\/td> Sadiya (enters Assam)<\/td> ~2,900 km (720 km in Assam)<\/td> Arunachal Pradesh, Assam<\/td> Bay of Bengal (via Bangladesh)<\/td><\/tr> Barak<\/strong><\/td>Manipur Hills (Nagaland-Manipur border)<\/td> Jiribam<\/td> ~564 km (221 km in Assam)<\/td> Manipur, Assam<\/td> Bay of Bengal (via Bangladesh)<\/td><\/tr> Subansiri<\/strong><\/td>Tibet<\/td> Gerhelong, Assam<\/td> ~442 km<\/td> Arunachal Pradesh, Assam<\/td> Brahmaputra (North bank)<\/td><\/tr> Manas<\/strong><\/td>Bhutan Himalayas<\/td> Barpeta district<\/td> ~376 km<\/td> Bhutan, Assam<\/td> Brahmaputra (North bank)<\/td><\/tr> Kopili<\/strong><\/td>Meghalaya Hills<\/td> Assam<\/td> ~290 km<\/td> Meghalaya, Assam<\/td> Brahmaputra (South bank)<\/td><\/tr> Dihing (Dehing)<\/strong><\/td>Patkai Hills<\/td> Upper Assam<\/td> ~287 km<\/td> Nagaland, Assam<\/td> Brahmaputra (South bank)<\/td><\/tr> Dhansiri<\/strong><\/td>Nagaland Hills<\/td> Golaghat district<\/td> ~352 km<\/td> Nagaland, Assam<\/td> Brahmaputra (South bank)<\/td><\/tr> Jiabharali (Kameng)<\/strong><\/td>