The Kali Gandaki starts at the north of Tibetan plateau of the Himalayas in the Mustang District of Nepal, near the Tibetan border. The two headwaters of river, Nup Chhu and Shar Chhu meet near the town of Lo Manthang in upper Mustang. These two rivers are also called the "West River" and "East River. These rivers then flow southwest with the name of Mustang Khola. In Kagbeni a major tributary, Kak Khola, flowing from Muktinath, meets Mustang Khola, and since then together this river is called the Kali Gandaki.
The course of this river advents southwards through a steep gorge known as the Kali Gandaki Gorge, or Andha Galchi, between the mountains Dhaulagiri (rising up to 8167 m) to the west and Annapurna (8091 m) to the east side. If one measures the depth of a canyon by the difference between the river height and the heights of the highest peaks on either side, the Gorge is the world's deepest. The course of the river between the Dhaulagiri and Annapurna massifs is at a height of between 1300 metres and 2600 metres. The river is much more older than the Himalayas.
The river is joined by Rahught Khola at Galeshwor at the south of the gorge, Myagdi Khola at Beni, Modi Khola near Kushma and Badigaad at Rudrabeni. The river then takes a right-angle turn and runs east. The largest hydroelectricity project in Nepal is located along this stretch of the river. A major tributary, Trishuli, at Devighat, joins Kali Gandaki just as the river exits the foothills of the Himalayas into the southern plains of Nepal. Masryangdi is a major tributary of Trisuli. From Devighat, the river flows southwest and is called Narayani or Sapt Gandaki. The river then meanders back towards the southeast and enters India.
The river flows across the Gangetic plain of Bihar state and eventually merges with the Ganga near at Hajipur or Patna. The entry point of the river at the Indo-Nepal border is at the convergence of Gandak, known as Triveni. Here, the rivers meet with Pachnad and Sonha also sliding into India from Nepal. Pandai River flows into the Indian state of Bihar from Nepal in the eastern end of the Valmiki Sanctuary and finally meets Masan. The drainage area of this river in India is 7620 sqkm. After the river enters India at Triveni, it flows for an extended length of 300 km and then joins the Ganga. Before merging with the river Ganga near Patna, it flows through the districts of Champaran, Sarang and Muzaffarpur. The total length of the Gandak River is 630 km out of which 330 km flows in Nepal and Tibet.
It is said that the Gandak River has changed and shifted its track about 80 km to the east due to slanting in the last 5000 years. The Gandak plains are called the Gandak Megafan and it comprises of Eastern Uttar Pradesh and North Western Bihar and lies in the Middle Gangetic Plains. The Gandaki river basin is known to contain 1025 glaciers and 338 lakes.
The important towns along the river are considered to have mythological importance. The major towns and cities located along the banks of the Gandak River are Lo Manthang, Jomsom, Devghat, Beni, Kusma, Baglung, Narayangarh, Ridi, Valmikinagar and Triveni. The river also forms the western border of the popular Chitwan National Park. Gorkha is an important town in the Trisuli river basin. Kali Gandaki is a well-known whitewater adventure spot.
Chitwan National Park of Nepal and Valmiki National Park of India are located just beside each other in the area of Valmikinagar around the Gandak Barrage. The park encompasses an area of 932 km²and is the oldest national park of Nepal established in 1973.
Valmiki National Park and Tiger Reserve is another park located on the banks of this river. Valmiki sanctuary covers about 800 km² of forest and is the 18th Tiger Reserve of the country and ranked fourth in terms density of Tiger population. Valmikinagar is also a well-inhabited town located in the northernmost part of the West Champaran district, bordering Nepal. The floral and faunal composition of this park with the prime protected carnivores in the National Conservation Programme of the Project Tiger in the year 1994 was remarkable. As per Zoological Survey of India's report of 1998 the Sanctuary is known to have 53 mammals, 145 birds, 26 reptile and 13 amphibians.
The notable selection of Wild Fauna include Tiger, Wild boar, Wild dog, Leopard, Bison, Bear, Partridge, Peacock, Hill mynah, Hornbill, python, Woolly-necked stork, Crocodile, Blue bull, Deer, Sambar, Hog deer and Barking deer. According to the Botanical Survey of India report 1998 there are seven types of vegetation consisting of seven categories of forests with 84 species of trees.
The Religious significance of Gandak River - The ancient Valmiki Ashram and surrounding temples are located nearby and a desired pilgrimage. It is said that Valmiki Rishi wrote the great epic, "Ramayana" here. It is also believed to be the birthplace of Luv & Kush, the two sons of Lord Ram and his wife Sita. Saligrama Sila and Mukthinath are places of worship, where the stones are collected from the bed of Gandak River at a place close to the Mustang district of Nepal. It is also a sacred place for Buddhists, who call it Chumig Gyatsa, which in Tibetan means 'Hundred Waters'. These stones are naturally formed round stones, with circular or spiral markings and are fossil ammonite stones. These stones are like ocean sediments, which have been uplifted to the top of the Himalayas. Other places of worship near this river are Muktinath-Chumig Gyatsa, Chakra-Tirtha, Nepali Mandir at Hajipur, Jamia Masjid, Vaishali and many more.
Places like Lauriya Nandan Gar, Mustang Caves and Someshwar Fort have special archeological significance along the Gandak River.
Navigation in Gandak River - Nepal and India has carried out studies on the possibility of having navigational use of the Gandak River. Studies indicate that a) it is feasible only in the lower reaches, b) link it with India's number 1 highway from Allahabad to haldia, and c) cognizance has to be taken of the adverse situation which could arise due to increased irrigation use in dry season which could restrict the level for maintaining river the river level for possible navigation
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