This river emerges from a cavern at the Rohtang pass and assumed different identities as the seasons go by .It flows from a clear blue easy flowing mountain river to an awesome torrent during the monsoon.On the right of this pass lies the source of the river Beas also known as “Beas Rishi”.This is the spot where the great thinker and writer of jthe Mahabharta ,Maharishi Vyas ,medidated.To the south of this source lies another source known as ’Beas Kund’.In ancient times the river was not known as the river Beas  but as “Arjiki” and till the time of the Mahabharata this remaind its name.The enemity between Rishi Vashisht and Vishwamitra is will known.It is said that once Vishwamitra killed a hundred sons of rishi Vashisht and in sheer agony Muni Vashisht jumped into the river arijki after having tied himself with ropes.But the river got him out of the water after removing the rope.this place is now known as Vashishath Village.According to legends since the river had broken the ropes tying Rishi Vashishth ,It became known as river vipasha .Today ,the world famous tourist resort of Manali is situated on ther right bank of  the river Beas.From Manali ,this holy river after passing through dense evergreen forests reaches the town of Kullu.There are many places on the banks of the river which are the symbols of ancient civilizations namely Manali,Naggar,Katrain ,Raisan,Kullu,Pandoh,Mandi and Sujanpur.The great sages Narad ,Vashisht,Vishwamitra,Bhrigu,Jamdagni,Bhardwaj,Vamdev,Kapijl,gautam,Shringi, Vyas ,Prashar came here on different occasions and mediated on the banks of this river,Till today their temples exist  in this valley of Vyas.Its main tributaries are ;the Parbati,the spin and the Malana nala in the east;and the Solang ,the Manalsu,the Sujoin,the Phojal and the Sarwari streams in the west.It has played a significant role in the development of peculiar hill culture which pervads the life of hill people living in the towns and surrounding villages since ages.We have to owe to this sacred river in terms of our culture,economy and social life .