Explanation:

The river systems of India can be classifi ed into four groups viz., y Himalayan rivers, y Deccan rivers, y Coastal rivers and y Rivers of the inland drainage basin.

• The Himalayan rivers are formed by melting snow and glaciers and therefore, continuously fl ow throughout the year. The main Himalayan river systems are those of the Indus and the GangaBrahmaputra-Meghna system.
• The Deccan rivers on the other hand are rain-fed and therefore fl uctuate in volume. Many of these are non perennial. In the Deccan region, most of the major river systems fl owing generally in the east fall into Bay of Bengal.
• The major east fl owing rivers are Godavari, Krishna, Cauvery and Mahanadi. Narmada and Tapti are major west fl owing rivers. The Godavari in the southern Peninsula has the second largest river basin covering 10 per cent of the area of India.
• A few rivers in Rajasthan do not drain into the sea. These are Luni, Machhu, Rupen, Saraswati, Banas, Ghaggar and others