Himalayan river system is largest river system in india.
himalayas are the cause of perennial river in india.
ganga and brahmaputra are the main rivers of himalaya river system
these rivers are the main source of irrigation.

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1.The main himalayan rivers are indus,ganga and brahmaputra.
2.These rivers are perennial ie they have water throughout the entire year.These rivers recieves water from rain as well as from melted snow.
3.The himalayan rivers have long courses from their source to the sea.
4.They perform intensive erosional activities in the upper courses and carry huge loads of silt and sand.