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Rivers of Nepal. (Nepal River Information)  

Nepal's rivers can be broadly divided into three categories in accordance with their origins. The first category comprises the three main river systems of the country-the Koshi, Gandaki and Karnali river systems, all of them originating from glaciers and snow-fed lakes. The Koshi river system consists of the Tamor, Arun, Dudhkoshi, Likhu, Tamakoshi, Sunkoshi and Indravati rivers. Of these, the Arun and Sunkoshi originate in Tibet. The confluence of these rivers is at Tribeni (near Dharan) in Sagarmatha Zone. Flowing for almost 10kms through a narrow gorge before entering the plains, the "Sapta Kosi" or he "Koshi" swollen with the waters of the seven rivers finally merges into the Ganges. The Gandaki river system in central Nepal consists of the Kaligandaki, Budhigandaki, Marsyanghi, Trishuli, Seti, Madi and Daraundi rivers. The Kaligandaki is the longest river and the Trishuli, the main tributary of this system.The Kaligandaki originates in Mustang and converges with the Trishuli at Deoghat in Chitwan. The river is then called the Narayani and goes on to meet the Ganges. The Karnali river system in western Nepal consists of the Humla Karnali, Mugu Karnali, Seti and Bheri rivers and is the longest river system in the country. The Humla Karnali, which rises in Tibet, is the main tributary. After entering India, this river assumes the name Gogra. Rivers like the Mechi, Mahakali, Bagmati, Kamala, Rapti, etc. most of which have their origin in the Mahabharat range, constitute the rivers of the second category. The Bagmati, which rises at Bagdwar and drains out through the Chobhar gorge, is the principal river of the Katmandu Valley. Streams and rivulets originating mostly from the Chure hills make up the third category; these rivers rely on monsoon rains and are otherwise dry.