The Beas River (European Name: Hyphasis) is a river in north India. The river rises in the Himalayas in central Himachal Pradesh, India, and flows for some 470 kilometres (290 mi) to the Sutlej River in the Indian state of Punjab. Its total length is 470 kilometres (290 mi) and its drainage basin is 20,303 square kilometres (7,839 sq mi) large.
The Beas River in Himachal Pradesh
|State||Himachal Pradesh, Punjab|
|Municipality||of the Indus|
|⁃ location||Himalayas, Himachal Pradesh|
|Length||470 km (290 mi)|
|Basin size||20.303 km2 (7.839 sq mi)|
|⁃ location||Mandi Plain|
|⁃ average||499.2 m3/s (17,630 cu ft/s)|
Before Veda Vyasa, the Vipasa river was known as Saraswathi. Rishi Vashishta, the Great Grandfather of Vyasa tried to jump into this river from an overlooking hillock, to sacrifice his soul. However, the river altered form to become a sandbed, saving him. On account of this incident, the great Rishi opted to settle near the river, and made it a residence for some years. Thereby, it became known as Vashisht (after Vashishta). We can find Vashishta Brahmarishi Temple in this village.
Vashistha, at that time, already had his lineage through his son Shakti, who in turn was the father of Parashar Rishi. Parashar is considered the father of Hindu Jyothisha (astrology) vide his authorship of Parashar Hora Shashtra. Veda Vyasa is the son of Parashar.
After settling near the river, Rishi Vashishta sired a different branch of descendants. He worshiped Lord Shiva at this place, giving rise to the name of "Rajeshwar" for Lord Shiva in the region.
In modern times it's also been called Bias or Bejah.
The Beas River marks the eastern-most border of Alexander the Great's conquests in 326 BCE. It was one of the rivers which created problems in Alexander's invasion of India. His troops mutinied here in 326 BCE, refusing to go any further; they had been away from home for eight years. Alexander shut himself in his tent for three days, but when his men did not change their desires he gave in, raising twelve colossal altars to mark the limit and glory of his expedition.
In the 20th century, the river was developed under the Beas Project for irrigation and hydroelectric power generation purposes. The second-phase Pong Dam was completed in 1974 followed by the first-phase 140 kilometres (87 mi) upstream, Pandoh Dam in 1977. The Pong Dam served initially to primarily provide irrigation below Talwara but was soon developed as well for power generation; its power station has a 360 MW installed capacity. The Pandoh Dam diverts the river through a system of tunnels and channels to the 990 MW Dehar Power Station on the Sutlej River, connecting both rivers.
The Shahnehar canal takes off from the Shahnehar barrage/headwork which is located just downstream of Pong dam to supply water for irrigation needs and four cascading power houses at the canal drops before releasing water further downstream in the Beas river. These power stations, named Mukerian hydel (12 units), has 207 MW total generating capacity. At the confluence with the Sutlej river, Harike barrage was constructed to divert the combined water flows of both rivers to irrigation canals to serve Rajasthan and Punjab areas.
The river rises 4,361 metres (14,308 ft) above sea-level on the southern face of Rohtang Pass in Kullu. It traverses the Mandi District and enters the Kangra District at Sandhol, 590 metres (1,940 ft) above sea-level. During its lower course the Beas is crossed by numerous ferries, many of which consist of inflated skins (darais). Near Reh in Kangra District it divides into three channels, which reunite after passing Mirthal, 300 metres (980 ft) above sea-level. On meeting the Sivalik Hills in Hoshiarpur, the river sweeps sharply northward, forming the boundary with Kangra District. Then bending round the base of the Sivalik Hills, it takes the southerly direction, separating the districts of Gurdaspur and Hoshiapur. After touching the Jalandhar district for a short distance, the river forms the boundary between Amritsar and Kapurthala. Finally the Beas joins the river Sutlej at the south-western boundary of Kapurthala district of Punjab after a total course of 470 kilometres (290 mi). The chief tributaries are Bain, Banganga, Luni and Uhal. The Sutlej continues into Pakistani Punjab and joins the Chenab River at Uch near Bahawalpur to form the Panjnad River; the latter in turn joins the Indus River at Mithankot.
On 8 June 2014, 24 engineering students and one tour operator, drowned when the flood gates of the Larji dam were opened. The students entered the river at place where warnings were installed and local people also warned them about sudden release of water in the river but they ignored and entered the river having little water. The water level rose suddenly to 5 to 6 feet (1.5 to 1.8 m), and the surge carried the students away.The tragedy represents foolishness, over excitement and under estimation of mountain rivers by the students and their tour operator. 
On May 17, 2018, countless number of fishes and other aquatic animals were found dead in Beas river due to release of molasses from a sugar mill situated on its shore at Kiri Afgana village in Gurdaspur district. Locals have noted that the river color has changed to rust brown and dead fishes were floating in the river. Punjab Pollution Control Board have ordered the closure of the factory and an enquiry has been initiated. Besides sealing, the sugar mill has been charged a fine of Rs. 25 lakh for this negligence.
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