1. Most of the Himalayan Rivers are perennial, fed by rains during monsoon and by the melting of snow in summer.
2. In their young (mountain) stage, they have carved erosional features like deep gorges, V-shaped valleys, rapids and waterfalls.
3. The main river systems are those of: (a) The Indus and (b)The Ganga-Brahmaputra-Meghna
4. The Indus rises near Mansarowar in Tibet, flows through India and Pakistan and meets the Arabian Sea near Karachi. Its important tributaries are Satluj, Beas, Ravi, Chenab and Jhelum.
5. The Ganga originates from its headstreams Bhagirathi and the Alaknanda. After they join at Dev Prayag, their course is called Ganga. It travels through Uttarakhand, Uttar Pradesh, Bihar and West Bengal and enters Bangladesh.
6. The rivers Yamuna, Ramganga, Ghaghara, Gandak, Kosi, Mahananda and son are the main tributaries of the Ganga.
7. The Padma (Ganga) and the Jamuna (Brahmaputra) join in Bangladesh and flow as the Meghna at the mouth.
8. The Brahmaputra rises in Tibet, and runs a long distance eastward till it enters India in Arunachal Pradesh. it passes through Assam before it enters Bangladesh to join the Ganga.
