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Sutlej River (Punjabi: ਸਤਲੁਜ, Sanskrit: शतद्रु or सुटुद्रि, IAST: Suṭudri, Urdu: ستلج, Hindi: सतलुज also known as Satluj), is the longest of the five rivers that flow through the historic cross-road region known as the Punjab in northern India as well as Pakistan, and is located north of the Vindhya Range, south of the Hindu Kush segment of the Himalayas, and east of the Central Makran range in Pakistan. Its source is in Tibet near Mount Kailash, and its terminus in Pakistani Punjab near the port city of Karachi via the Indus.

It is the easternmost tributary river of the Indus River, which overall waters the ancient and historically important region of Greater Punjab. Located in the shadow of the Vindhya range, the region to its south and east is arid and known in different regions as the Great Indian Desert or Thar Desert, which more or less parallels both the river and the border between Pakistan and Rajistan. Flowing generally south-southwest from its headwaters, the Sutlej River joins first with the Beas River in the state of Punjab, India and continues south-westerly into Pakistan to mix with the Chenab River, forming the Panjnad River south of ancient Multan. From the confluence near Khanpur, the Panjnad joins the Indus River at Mithankot, whereafter the large river flows through a gorge near Sukkur and flows through a fertile plains region known as the Sind until it reaches the Arabian Sea.

The Sutlej was known as Shatadru or Suṭudri to Indians in the Vedic period.

Sutlej Valley from Rampur ca. 1857

A heavy freight canal, known as the SLY (Sutlej-Yamuna Link), is being built eastwards through Punjab near an ancient caravan route and highlands pass from the Sutlej watershed to connect near the source of the largest tributary of the Ganges, the Yamuna river, and when complete will allow shipping from India's east coast to the west coast.

The waters of the river are allocated to India under the Indus Waters Treaty between India and Pakistan. At present, most of its water is diverted to irrigation canals and used up in India. [1] The Bhakra-Nangal Dam is a huge multipurpose dam on the river.

There is substantial evidence to indicate that prior to 1700 B.C. the Sutlej was once an important tributary of the Sarasvati River, instead of the Indus River. It is believed that tectonic activity created elevation changes that redirected the Sutlej from southeast to southwest. Once flowing in its new westward direction, the river eventually joined the Beas river. As a result, the mighty Sarasvati River began to dry up, causing the desertification of Cholistan and the eastern part of the modern state of Sindh, as well as the abandonment of numerous ancient human settlements along its banks.

Geography of Himachal Pradesh
Lakes	Renuka Lake | Maharana Pratap Sagar | Gobind Sagar (more...)
Rivers	Beas | Chenab | Ravi | Sutlej | Yamuna
Districts	Bilaspur | Chamba | Hamirpur | Kangra | Kinnaur | Kullu | Lahul and Spiti | Mandi | Sirmaur | Shimla | Solan | Una
Other	Climate of Himachal Pradesh | Protected areas of Himachal Pradesh | List of peaks in Himachal Pradesh

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Chenab · Ravi · Jhelum · Beas · Satluj · Sindh · Hakra · Sandal Bar · Neeli Bar · Ganji Bar · Kirana Bar · Kirana Mountain Range · Suleman Mountain Range · Shiwalik Mountain Range · Thal · Cholistan · Murree · Kallar Kahar · Pothohar Plateau · Salt Range · Margalla Hills · Majha · Doaba · Malwa · Powadh · Khewra Salt Mines · Kachhi · Chhachh · Trimmu Headworks · Soon Sakesar