•   The Kosi is a transboundary river which flows through China, Nepal and India.

•   It drains the northern slopes of the Himalayas in Tibet and the southern slopes in Nepal.

•   From a major confluence of tributaries north of the Chatra Gorge onwards, the Kosi River is also known as Saptakoshi for its seven upper tributaries.

•   These include the Tamor River originating from the Kanchenjunga area in the east and Arun River and Sun Kosi from Tibet.

•   The Sun Koshi's tributaries from east to west are Dudh Koshi, Bhote Koshi, Tamakoshi River, Likhu Khola and Indravati.

•   The Saptakoshi crosses into northern Bihar, where it branches into distributaries before joining the Ganges near Kursela in Katihar district.

•   Note: Location of this river is available on the first map of Rivers.

•   Gomati River is a tributary of the Ganges. According to beliefs, the river is the son of Rishi Vashishtha.

•   Originates from Gomat Taal in fulhar village of tehsil kalinagar, Pilibhit.

•   A major tributary is the Sai River, which joins the Gomti near Jaunpur.

•   The major sources of pollution are industrial waste and effluent from sugar factories and distilleries.

•   Note: Location of this river is available on the first map of Rivers.

•   Ghaghara River, called Karnali River in Nepal and Mapcha Tsangpo in Tibet, is a perennial trans-boundary river that originates in the northern slopes of the Himalayas in the Tibetan Plateau, cuts through the Himalayas in Nepal and joins the Sharda River at Brahmaghat.

•   It is the largest tributary of the Ganges by volume and the second largest by length after Yamuna.

•   Tributaries 

o  Left: Bheri, Kuwana, Rapti, Chhoti Gandak

o  Right: Seti, Dahawar, Sarda, Budhi Ganga

•   Bardia National Park is the largest and most undisturbed protected area in the Karnali River basin on the southern slopes of the Sivalik Hills.

•   The Karnali supports the endangered mugger crocodile, the gharial, a few remaining South Asian River dolphins and the golden mahseer.

•   Note: Location of this river is available on the first map of Rivers.

•   Gandak is one of the major rivers in Nepal and a left bank tributary of the Ganges.

•   In the Nepal Himalayas, it is notable for its deep canyon.

•   The basin also contains three mountains namely Dhaulagiri, Manaslu and Annapurna I.

•   Dhaulagiri is the highest point of the Gandaki basin.

•   Tributaries 

o  Left: Trishuli, Budhi Gandaki, Marshyangdi, Madi, Seti Gandaki, Daraudi, Kali Gandaki

o  Right: Badigad River

•   Chitwan National Park of Nepal and Valmiki National Park of India are adjacent to each other in the vicinity of Valmikinagar around the Gandak Barrage.

•   Note: Location of this river is available on the first map of Rivers.