The Himalayan drainage consists of several river systems but the following are the major river systems :
(i) The Indus River System : It is one of the largest river basins of the world covering an area of 1165000 sq. km. It carries about 73.31 cubic km of water out of which India can utilise only 46 cubic km. The Indus river originates in the Tibetan region at an altitude of 4164 m in Kailash Mountain range.
Jhelum is an important tributary of the Indus. It rises from a spring at Verinag situated at the foot of Pir Panjal in Southeastern part of the valley of Kashmir. Out of its total drainage area of this basin, only 28490 sq. km lies in India.
The Chenab is the largest tributary of the Indus. The Ravi also known as the Iravati is another important tributary of the Indus. It rises west of the Rohtang pass in Kullu hills of Himachal Pradesh and flows through the Chamba Valley of the State. It covers a drainage area of 5957 sq. km in India.
The Beas also known Vipasha or Argikiya is another important river tributary of the Indus. It originates from Beas Kund near the Rohtang Pass at an elevation of 4000 m.
Satluj or Satudri, an important tributary of the Indus, originates in the Rakas lake near Mansarovar at an altitude of 4555 m in Tibet.
(ii) The Ganga System : Ganga is the important river of India both from the point of view of its basin and cultural significance. It rises in Gangotri glacier near Gomukh (3900 m) in Uttaranchal. Its main tributary is Yamuna. Other rivers are -Chambal, Sindh, Betawa and Kosi. In the northern side the tributaries are Gandak, Ghaghara, Sarda, Gomati, Kosi, Ramganga etc. Damodar occupies the eastern margin and joins the Hugli.
(iii) Brahmaputra System : Brahmaputra, one of the largest rivers of the world, has its origin in Chamyung glacier of Kailash range near Mansarover lake. In Tibet, it is known as Tsangpo.
The Brahmaputra receives numerous tributaries in its 750 km long journey in the Assam Valley.
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